@article { ISI:000240521800008, title = {Adsorption of methanol on Si(100)/SiO(2)and mesoporous SBA-15}, journal = {Colloids and Surfaces A-Physicochemical and Engineering Aspects}, volume = {287}, number = {1-3}, year = {2006}, month = {SEP}, pages = {51-58}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Adsorption of methanol on SiO(100)/SiO2 substrate and mesoporous SBA-15 has been studied by using Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). Contact angle technique is employed to study the adsorption kinetics of methanol on SiO(100)/SiO2 and thermal stability of adlayer. Thermogravimetric (TGA) technique is used to understand the thermal behavior of methanol layer on SBA-15. Adsorption kinetics fit fairly well with Langmuir isotherms giving adsorption rate constant, k(a) = 0.0021 W s(-1). FTIR results show formation of methoxy silicon (SiOCHA silicon polyhydride (SiH2), carboxylate, molecular water and hydroxyl groups on Si(100)/SiO2 surface and only methoxy silicon on SBA-15. XPS results confirm methanol adsorption and support FTIR results. The methanol adlayers are found to be thermally stable up to a temperature of similar to 262 degrees C on both Si(100)/SiO2 and SBA-15 and decompose between 262 and 450 degrees C. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, desorption, kinetics, Methanol, SBA-15, Si(100)/SiO2, thermal stability}, issn = {0927-7757}, doi = {10.1016/j.colsurfa.2006.03.021}, author = {Mirji, S. A. and Halligudi, Shivaraj B. and Mathew, Nevin T. and Ravi, V. and Jacob, Nalini E. and Patil, K. R.} } @article { ISI:000237835100010, title = {Adsorption of octadecyltrichlorosilane on mesoporous SBA-15}, journal = {Applied Surface Science}, volume = {252}, number = {12}, year = {2006}, month = {APR}, pages = {4097-4103}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Adsorption of octadecyltrichlorosilane (OTS) on mesoporous SBA-15 has been studied by using Brunauer-Emmett-Teller (BET) surface area analysis, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermo-gravimetric analysis (TGA) techniques. BET surface area analysis shows decrease of surface area from 930 to 416 m(2)/g after OTS adsorption. SEM pictures show close attachment of SBA-15 particles. EDAX measurements show increase of carbon weight percentage and decrease of oxygen and silicon weight percentage. XPS results closely support EDAX analysis. FTIR spectra shows presence of methyl (-CH3) and methylene (-CH2) bands and oriented OTS monolayer on SBA-15. Thermo-gravimetric analysis shows that the OTS adsorbed on SBA-15 are stable up to a temperature of 230 degrees C and that the OTS monolayers decompose between 230 and 400 degrees C. (c) 2005 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, OTS, SBA-15, Self-assembly, thermal stability}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2005.06.009}, author = {Mirji, S. A. and Halligudi, Shivaraj B. and Sawant, Dhanashri P. and Jacob, Nalini E. and Patil, K. R. and Gaikwad, A. B. and Pradhan, S. D.} } @article { ISI:000241976500018, title = {Adsorption of octadecyltrichlorosilane on Si(100)/SiO2 and SBA-15}, journal = {Colloids and Surfaces A-Physicochemical and Engineering Aspects}, volume = {289}, number = {1-3}, year = {2006}, month = {OCT}, pages = {133-140}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Adsorption of octadecyltrichlorosilane (OTS) on Si(100)/SiO2 substrate and mesoporous SBA-15 has been studied by energy dispersive X-ray analysis (EDAX), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). Contact angle technique is used to study the adsorption kinetics of OTS on Si(100)/SiO2 and thermal stability of adsorbed OTS layer. Thermogravirnetric (TGA) technique is employed to understand the thermal behavior of OTS adlayer on SBA-15. Langmuir isotherms fit very well with OTS adsorption kinetics data on Si(100)/SiO2 and furnish adsorption rate constant, k(a) = 236 M-1 s(-1), desorption rateconstant, k(d) = 0.0082s(-1) and Gibbs free energy of adsorption, Delta G(ads) = -6.28 kcal mol(-1). EDAX and XPS results both show increased carbon content due to OTS adsorption and decreased oxygen and silicon content due to screening of these elements by OTS adlayer. FTIR data shows methylene (-CH2) and methyl (-CH3) stretching bands, in close agreement with reported data. The OTS layers are found to be thermally. stable up to a temperature of approximate to 260 degrees C on both Si(100)/SiO2 and SBA-15. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Gibbs free energy, OTS, SBA-15, Self-assembly, Si(100)/SiO2, thermal stability}, issn = {0927-7757}, doi = {10.1016/j.colsurfa.2006.04.021}, author = {Mirji, S. A.} } @article { ISI:000242285000001, title = {Comparative assessment of downstream processing options for lactic acid}, journal = {Separation and Purification Technology}, volume = {52}, number = {1}, year = {2006}, month = {NOV}, pages = {1-17}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The possibility of manufacturing a biodegradable polymer from lactic acid has led to extensive research in recovery of lactic acid produced by fermentation, by different downstream processing routes. This paper assesses the suitability of different downstream processing options such as reactive extraction, adsorption, electrodialysis, esterification and reactive distillation. It compares the costs of different process routes. The assessment indicates that the conventional precipitation of calcium lactate, followed by acidification, esterification and hydrolysis will be the most economical route although it generates large quantity of gypsum sludge. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, electrodialysis, Esterification, Lactic acid, Reactive distillation, reactive extraction}, issn = {1383-5866}, doi = {10.1016/j.seppur.2006.03.015}, author = {Joglekar, H. G. and Rahman, Imran and Babu, Suresh and Kulkarni, B. D. and Joshi, Ajit} } @article { ISI:000236691000034, title = {Reverse microemulsion mediated sol-gel synthesis of lithium silicate nanoparticles under ambient conditions: Scope for CO2 sequestration}, journal = {Chemical Engineering Science}, volume = {61}, number = {10}, year = {2006}, month = {MAY}, pages = {3415-3418}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

We report on the synthesis of nanocrystalline lithium silicate by coupling of sol-gel method in reverse microemulsion. The sample calcined at 800 degrees C gives pure phase lithium metasilicate nanocrystallites. X-ray diffraction and transmission electron microscopy confirmed the formation of nanocrystalline lithium silicate particles with a narrow size distribution. The nanoparticle prepared in the microemulsion shows enhanced CO2 sorption capacity and shorter retention times at higher temperature (similar to 131 ml/g at STP at 610 degrees C which are better than the best known results. (c) 2005 Elsevier Ltd. All rights reserved.

}, keywords = {Adsorption, Carbon dioxide, Microemulsion, particle, separations, sol-gel, surfactant}, issn = {0009-2509}, doi = {10.1016/j.ces.2005.11.065}, author = {Khomane, Ramdas B. and Sharma, B. K. and Saha, S. and Kulkarni, B. D.} } @article { ISI:000242511300022, title = {Adsorption of methanol on mesoporous SBA-15}, journal = {Materials Letter}, volume = {61}, number = {1}, year = {2007}, month = {JAN}, pages = {88-92}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The adsorption of methanol onmesoporous SBA-15 has been studiedbyrising Brunauer-Emmett-Teller (BET) surface area analysis, scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray photoclectrom spectroscopy (XPS) and tbennogravimettic analysis (TGA). The BET surface area analysis shows decreases of the surface area from 387 to 383 m(2)/g, pore volume from 0.88 to 0.81 cm(3)/g and pore diameter from 9.07 to 8.4 mm after methanol adsorption. The appearance of strong IR bands at 2862 and 2964cm(-1) due to methyl (-CH3) symmetric and asymmetric stretching demonstrate the presence of methanol and evidence of successful methanol adsorption. XPS results show increase of carbon and oxygen content on the surface of SBA-15. Thermogravirriettic analysis shows that the methanol adsorbed on SBA-15 is stable up to a temperature of 265 degrees C and that the methanol adlayers decompose between 265 and 588 degrees C. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Electron microscopy, Methanol, SBA-15, Surfaces, thermal stability}, issn = {0167-577X}, doi = {10.1016/j.matlet.2006.04.012}, author = {Mirji, S. A. and Halligudi, Shivaraj B. and Mathew, Nevin T. and Jacob, Nalini E. and Patil, K. R. and Gaikwad, A. B.} } @article { ISI:000247759200023, title = {Adsorption of zinc from aqueous solution using chemically treated newspaper pulp}, journal = {Bioresource Technology }, volume = {98}, number = {16}, year = {2007}, month = {NOV}, pages = {3136-3141}, publisher = {ELSEVIER SCI LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

Adsorption of zinc was studied using chemically modified newspaper pull) as an adsorbent in the aqueous medium. Quantitative chemical analysis showed the presence of trace quantities of some inorganic elements along with phosphorous in TNP. The experimental adsorption data fitted reasonably well to both Freundlich and Langmuir isotherm. pHzpc of TNP was 5.1, which indicated that the adsorbent was more potential for cationic adsorption. The adsorption kinetic data followed a pseudo-second order model for zinc. Optimum Zn2+ loading was 9.20 mg/g for 10.31 mg/l initial zinc concentration at pH 5.80. Zn2+ loading on TNP was dependent on initial zinc concentration. TNP was a potential adsorbent for the removal of Zn from the effluent of electroplating industry. (c) 2007 Elsevier Ltd. All rights reserved.

}, keywords = {Adsorption, newspaper pulp, TNP, zinc}, issn = {0960-8524}, doi = {10.1016/j.biortech.2006.10.040}, author = {Chakravarty, S. and Bhattacharjee, S. and Gupta, K. K. and Singh, M. and Chaturvedi, Hema T. and Maity, S.} } @article { ISI:000243655000034, title = {Blocking effects in irreversible adsorption of linear macromolecules}, journal = {Surface Science}, volume = {601}, number = {1}, year = {2007}, month = {JAN}, pages = {274-279}, publisher = {ELSEVIER SCIENCE BV}, type = {JAN}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

{A new variant of random sequential adsorption (RSA), namely random sequential ballistic adsorption (RSBA), is proposed to explore the possible role of blocking effects in the adsorption dynamics of ballistically arriving objects. These objects upon adsorption can protrude outside the substrate and in turn can obstruct and hence reject the adsorption of newly arriving objects. Adsorption of linear macromolecules (modeled as infinitesimally thin needles), on a two-dimensional continuum substrate is studied using RSBA model. It is shown analytically that in late time regime, the number n(t) of adsorbed objects at time t follows a power law n(t) similar to t(alpha), as in RSA, but with a different exponent

}, keywords = {Adsorption, adsorption kinetics, Monte Carlo simulations, random sequential adsorption (RSA)}, issn = {0039-6028}, doi = {10.1016/j.susc.2006.09.031}, author = {Shelke, Pradip B. and Banpurkar, Arun G. and Ogale, S. B. and Limaye, A. V.} } @article { ISI:000251153900031, title = {Impact of orientational distribution of adsorbing objects on dynamics of Random Sequential Ballistic Adsorption (RSBA) dynamics}, journal = {Surface Science}, volume = {601}, number = {21}, year = {2007}, month = {NOV}, pages = {5010-5015}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Recently, by proposing a new variant of Random Sequential Adsorption (RSA) namely Random Sequential Ballistic Adsorption (RSBA) model [Pradip B. Shelke, A.G. Banpurkar, S.B. Ogale, A.V. Limaye, Surf. Sci. 601 (2007) 274], we addressed the issue of adsorption dynamics of extended objects where the objects, upon adsorption, protrude outside the substrate. This study brought out the role of the arriving trajectory in the adsorption dynamics. In the present work the possible role of the orientational distribution of the arriving objects in the RSBA dynamics is investigated. The dynamics of RSBA of needles (line segments) is studied analytically and by computer simulation for different types of theta distributions of arriving needles, theta being the angle made by the arriving needle with normal to the substrate. Three types of theta distributions, namely a uniform distribution over the range (0, pi/2), a Gaussian distribution and a distribution uniform over the solid angle, are considered. Analytical treatment establishes that in all the three cases, the number n(t) of adsorbed objects at a late time t follows a power law n(t) similar to t(alpha), and the exponent a depends on the specifics of the theta distribution. In general, for distribution f(theta) proportional to theta(beta), for theta -\> 0, alpha is found to be 2/(beta + 3). The simulation results are in excellent agreement with the analytical findings and together they reveal that the orientational distribution of arriving objects has significant consequences for the Random Sequential Ballistic Adsorption (RSBA) process. (C) 2007 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, adsorption kinetics, Monte Carlo simulations, random sequential adsorption (RSA)}, issn = {0039-6028}, author = {Shelke, Pradip B. and Banpurkar, Arun G. and Ogale, Satishchandra B. and Limaye, A. V.} } @article { ISI:000257637000008, title = {Adsorption of fluoride ions by Zn-Al layered double hydroxides}, journal = {Applied Clay Science}, volume = {40}, number = {1-4}, year = {2008}, month = {JUN}, pages = {54-62}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Zn-Al layered double hydroxides (LDHs) with different molar ratios Zn/Al (0, 0.17, 0.34, 0.97, 3.47, proportional to) were prepared by the co-precipitation of chlorides, characterized and evaluated for their fluoride adsorption at room temperature from aqueous solutions. The fluoride adsorption of the as-synthesized LDHs was influenced by the chemical composition of the LDHs and ZA-11 (Zn/Al = 0.97) had the highest capacity for fluoride adsorption (1.14-4.16 mg/g). The adsorption increased after calcination of the LDH up to 500 degrees C. The equilibrium data were fitted to the Freundlich, Langmuir, and Temkin equations. The kinetics of fluoride adsorption followed the pseudo-second order model. (C) 2007 Elsevier B.V All rights reserved.

}, keywords = {Adsorption, Anionic clay, Fluoride, Layered double hydroxide}, issn = {0169-1317}, doi = {10.1016/j.clay.2007.07.004}, author = {Mandal, Sujata and Mayadevi, S.} } @article { ISI:000257474100021, title = {Cellulose supported layered double hydroxides for the adsorption of fluoride from aqueous solution}, journal = {Chemosphere}, volume = {72}, number = {6}, year = {2008}, month = {JUN}, pages = {995-998}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, type = {Article}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Cellulose supported layered double hydroxides (CSLDHs) were synthesized and tested for adsorption of fluoride in aqueous medium. Three samples of cellulose supported LDHs were synthesized by varying the LDH loading on cellulose. The raw cellulose, unsupported LDH and cellulose supported LDHs were characterized by XRD, SEM and BET surface area. Batch adsorption as well as fixed-bed column experiments were performed for determining the fluoride adsorption characteristics of CSLDHs. The fluoride adsorption properties of CSLDHs were found to be superior to that of reported adsorbents, including activated alumina and carbon nanotubes. Defluoridation capacity of the CSLDHs was 2-4 times higher than that of unsupported LDH. The cellulose supported LDH, CSLDH-50, having an LDH loading of 27\% showed maximum fluoride uptake capacity (5.29 mg g(-1) of CSLDH, 25.18 mg g(-1) of LDH) in fixed-bed column study. (C) 2008 Elsevier Ltd. All rights reserved.

}, keywords = {Adsorption, cellulose, Fluoride, Layered double hydroxide}, issn = {0045-6535}, doi = {10.1016/j.chemosphere.2008.03.053}, author = {Mandal, Sujata and Mayadevi, S.} } @article { ISI:000261410200003, title = {Environment friendly crosslinked chitosan as a matrix for selective adsorption and purification of lipase of aspergillus niger}, journal = {International Journal of Biological Macromolecules}, volume = {43}, number = {5}, year = {2008}, month = {DEC}, pages = {422-425}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Chitosan and its derivatives have been used as affinity matrices for purification of lipase from Aspergillus niger NCIM 1207. Trimellitic anhydride (TMA)-crosslinked deacetylated chitin adsorbed lipase selectively, yielding approximately 5-fold purification of the crude lipase with 70\% yield. Further 9-fold purification occurred on eluting through Sephacryl-100. These results suggest that chitosan derivatives can be used as inexpensive biopolymer matrices for the purification of lipases for industrial applications. (C) 2008 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Chitosan, Lipase, Matrix, Purification}, issn = {0141-8130}, doi = {10.1016/j.ijbiomac.2008.08.005}, author = {Trimukhe, K. D. and Mahadik, N. D. and Gokhale, D. V. and Varma, Anjanikumar} } @article { ISI:000267267000126, title = {Defluoridation of water using as-synthesized Zn/Al/Cl anionic clay adsorbent: equilibrium and regeneration studies}, journal = {Journal of Hazardous Materials}, volume = {167}, number = {1-3}, year = {2009}, month = {AUG}, pages = {873-878}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Zn/Al/Cl anionic clay has been synthesized by co-precipitation method and applied for adsorption of fluoride in aqueous medium. Equilibrium adsorption data were fitted to Langmuir, Freundlich, Temkin, and Generalized isotherm equations. Thermodynamic parameters like Delta G and Delta H values show the feasibility and exothermic nature of the adsorption process. Influence of solution pH and presence of other anions on fluoride adsorption by the clay has also been studied. Presence of carbonate in water was found to have an adverse effect on fluoride adsorption by the clay. pH(pzc) of the clay has been found to be 8.97. A two-step 1st order kinetic model was used to explain the fluoride adsorption kinetics of the as-synthesized clay. It was possible to regenerate the adsorbent with an aqueous solution of 0.01 M NaOH and the effect of regeneration on fluoride adsorption was reported up to five regeneration cycles. (C) 2009 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Anionic clay, Fluoride, Isotherm, kinetics, Regeneration}, issn = {0304-3894}, doi = {10.1016/j.jhazmat.2009.01.069}, author = {Mandal, Sujata and Mayadevi, S.} } @article { ISI:000262582400008, title = {Kinetic evidence for the influence of subsurface oxygen on palladium surfaces towards CO oxidation at high temperatures}, journal = {Chemistry-an Asian Journal}, volume = {4}, number = {1}, year = {2009}, month = {OCT}, pages = {74-80}, publisher = {WILEY-V C H VERLAG GMBH}, address = {PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY}, abstract = {

Transient state kinetics of the catalytic oxidation of CO with 0, on Pd-surfaces has been measured under isothermal conditions by using a molecular beam approach. Systematic studies were carried out as a function of reaction temperature and CO+O(2) composition. With sufficient kinetic evidence, we have demonstrated the positive influence of subsurface oxygen towards CO-adsorption and oxidation to CO, at high temperatures (600-900 K) on Pd-surfaces, and the likely electronic nature of the surface changes with oxygen in the subsurface. These studies also provide a direct proof for CO-adsorption with a significantly reactive sticking coefficient at high temperatures on Pd-surfaces exhibiting a significant subsurface O-coverage.

}, keywords = {Adsorption, kinetics, Oxidation, Palladium, surface analysis}, issn = {1861-4728}, doi = {10.1002/asia.200800278}, author = {Gopinath, Chinnakonda S. and Thirunavukkarasu, Kandasamy and Nagarajan, Sankaranarayanan} } @article { ISI:000284342100003, title = {Adsorption of fluoride from aqueous solution by alumina of alkoxide nature: batch and continuous operation}, journal = {Desalination}, volume = {264}, number = {1-2}, year = {2010}, month = {DEC}, pages = {15-23}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

In this investigation, we report the adsorption potential of alkoxide origin alumina for defluoridation of drinking water using batch and continuous mode of operations. The effects of different operating parameters such as adsorbent dose, initial fluoride concentration, pH of the solution and interfering ions (usually present in groundwater) were studied with a view to understand the adsorption behavior of the material under various conditions. A thermodynamic study shows that the adsorption of fluoride by alkoxide origin alumina is an exothermic and spontaneous process. The kinetic results showed that the fluoride sorption follows pseudo-second-order kinetics. The applicability of adsorbent in the field is also tested through column breakthrough studies. It has been observed that with an increase in the flow rate and initial fluoride concentration, the breakthrough curve becomes sharper and the breakthrough time and adsorbed fluoride ion concentration decrease. The breakthrough curve also becomes steeper as the bed height increases. The alkoxide origin alumina based adsorbent media can be used directly for field applications since it is also commercially available in granular form. (C) 2010 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Alkoxide alumina, Breakthrough studies, Fluoride, Kinetic modeling}, issn = {0011-9164}, doi = {10.1016/j.desal.2010.07.001}, author = {Kamble, Sanjay P. and Deshpande, Gunavant and Barve, Prashant P. and Rayalu, Sadhana and Labhsetwar, Nitin K. and Malyshew, Alexander and Kulkarni, Bhaskar D.} } @article { ISI:000288274200014, title = {Adsorption of cresols on zinc-aluminium hydroxides - a comparison with zeolite-X}, journal = {Separation Science and Technology}, volume = {46}, number = {3}, year = {2011}, month = {JAN}, pages = {PII 934305034}, publisher = {TAYLOR \& FRANCIS INC}, address = {530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA}, abstract = {

Liquid phase adsorption of m-cresol on Zn-Al hydroxide adsorbents with three different Zn/Al molar ratios was studied in different solvents and compared with commercial zeolite 13X. Among the three adsorbents, ZA-16 showed adsorption capacity similar to commercial zeolite 13X. Solvents used for the preparation of m-cresol solution were found to influence the adsorption capacity. The adsorption capacity was maximum for the solution of m-cresol in n-hexane. Conventional Langmuir and Freundlich adsorption isotherm equations were used to explain the adsorption behavior. The kinetics of m-cresol adsorption followed the first-order Lagergren kinetic model. p-Cresol/m-cresol separation factor was the highest when toluene was used as the organic medium.

}, keywords = {Adsorption, cresol, zeolite, zinc-aluminium hydroxide}, issn = {0149-6395}, doi = {10.1080/01496395.2010.510494}, author = {Vijayakumar, J. and Chikkala, Suresh K. and Mandal, Sujata and Mayadevi, S.} } @article { ISI:000298518600028, title = {Adsorption induced enzyme denaturation: the role of protein surface in adsorption induced protein denaturation on allyl glycidyl ether (AGE)-ethylene glycol dimethacrylate (EGDM) copolymers}, journal = {Colloids and Surfaces B-Biointerfaces}, volume = {90}, year = {2012}, month = {FEB}, pages = {184-190}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The effects of protein size on adsorption and adsorption-induced denaturation of proteins on copolymers of allyl glycidyl ether (AGE)-ethylene glycol dimethacrylate (EGDM) have been studied. Different responses were observed for the amount of protein adsorbed and denatured on the polymer surface for different proteins (trypsin, alchol dehydrogenase from baker{\textquoteright}s yeast (YADH), glucose dehydrogenase (GDH) from Gluconobacter cerinus, and alkaline phosphates from calf intestinal mucosa (CIAP). Protein adsorption on the copolymer with 25\% crosslink density (AGE-25) was dependent not only on the size of the protein but also on the presence of glycoside residues on the protein surface. Adsorption and denaturation of proteins follows the order YADH \> trypsin \> GDH \>\> CIAP although the molecular weights of the proteins follow the order YADH \> CIAP \> GDH \> trypsin. The lack of correlation between amount of adsorbed protein and its molecular weight was due to the presence of glycoside residues on CIAP and GDH which protect the enzyme surface from denaturation. Enzyme stabilities in aqueous solutions of 1-cyclohexyl-2-pyrrolidinone (CHP) correlate well with the trend in denaturation by the copolymer, strongly suggesting that hydrophobic interactions play a major role in protein binding and the mechanism of protein denaturation is similar to that for water-miscible organic solvents. (C) 2011 Elsevier B.V. All rights reserved.

}, keywords = {1-Cyclohexyl-2-pyrrolidinone, Adsorption, Alcohol dehydrogenase, Alkaline phosphatase, allyl glycidyl ether, Denaturation, ethylene glycol dimethacrylate, Glucose dehydrogenase, Trypsin}, issn = {0927-7765}, doi = {10.1016/j.colsurfb.2011.10.022}, author = {Thudi, Lahari and Jasti, Lakshmi Swarnalatha and Swarnalatha, Y. and Fadnavis, Nitin W. and Mulani, Khudbudin Baban and Deokar, Sarika Babasaheb and Ponrathnam, Surendra} } @article { ISI:000307972400024, title = {Adsorption of methylene blue using green pea peels (Pisum sativum): a cost-effective option for dye-based wastewater treatment}, journal = {Biotechnology and Bioprocess Engineering}, volume = {17}, number = {4}, year = {2012}, month = {AUG}, pages = {862-874}, publisher = {KOREAN SOC BIOTECHNOLOGY \& BIOENGINEERING}, address = {KOREAN SCIENCE TECHNOLOGY CENTER, \#704 YEOGSAM-DONG, KANGNAM-KU, SEOUL 135-703, SOUTH KOREA}, abstract = {

Methylene blue (MB), a common toxic dye, is largely discharged from dyeing processes for acrylic, nylon, silk, and woolen fabrics in textile industries. While application of conventional removal processes like chemical precipitation, ion exchange, commercial activated carbon adsorption, etc often become cost-prohibitive, the adsorption of MB by abundantly available green pea peel (GPP: Pisum sativum) derived and acid-treated carbon (GPP-AC) has proved to be a cost-attractive option in the present study. The physicochemical and morphological characteristics of GPP-AC were examined with the help of XRD, BET surface area, SEM, and Fourier transform infrared spectrophotometry ((FT-IR) analysis. The influences of such adsorption parameters as initial dye concentration, pH, contact time, adsorbent dosage, agitation speed, particle size, and temperature were evaluated and optimized. The equilibrium contact time for maximum adsorption of MB on to GPPAC was found to be 7 h. The equilibrium data of the adsorption process were modeled by using the Langmuir, Freundlich, Temkin, and Dubinin-Raduskevich (D-R) isotherms. However, the adsorption equilibrium data were best described by the Langmuir Isotherm model, with a maximum adsorption capacity of 163.94 mg MB/g GPPAC at 30A degrees C.

}, keywords = {Adsorption, Dubinin-raduskevich, Freundlich, green peas peels, Isotherms, Langmuir, Methylene blue, Temkin}, issn = {1226-8372}, doi = {10.1007/s12257-011-0614-5}, author = {Dod, Ramesh and Banerjee, Goutam and Saini, S.} } @article { ISI:000323644600048, title = {Enhanced dual-effect of adsorption and photodegradation of SiO2 embedded TiO2 hybrid catalyst for improved decolourization of methylene blue}, journal = {Water Air and Soil Pollution}, volume = {224}, number = {9}, year = {2013}, month = {SEP}, pages = {1726}, publisher = {SPRINGER}, address = {VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS}, abstract = {

Dual-effects of adsorption and photodegradation over titania, silica embedded titania, silica and commercial Degussa P-25 samples were studied for the decolourization of methylene blue in aqueous medium. Silica embedded titania and silica were prepared using inexpensive polymeric version of ethyl silicate as a source of silica. Catalysts were characterized by X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy and low temperature (77 K) nitrogen adsorption measurements. Among all the catalysts, silica embedded titania has exhibited faster decolourization of methylene blue solution on account of the enhancement of adsorption followed by degradation. An amount of the catalyst and the initial dye concentration of MB solution were found to influence the decolourization activity. Compared to titania catalyst, silica embedded titania and Degussa P-25 have shown the red shift in their UV-Vis spectrum. The experimental data of the reaction fitted well to the pseudo first order kinetic model. In present studies, the adsorption mechanism for the decolourization of MB solution was found to be applicable for an intra particle diffusion model.

}, keywords = {Adsorption, kinetic model, Methylene blue, Photodegradation, Silica embedded titania}, issn = {0049-6979}, doi = {10.1007/s11270-013-1726-7}, author = {Sonar, Shilpa K. and Wagh, Reshma V. and Niphadkar, Prashant S. and Joshi, Praphulla N. and Deshpande, Shilpa S. and Awate, Shobhana V.} } @article { ISI:000329153300077, title = {Morphology, polymorphism, and metal ion adsorption studies of electrospun nanofibers based on pvdf and organically modified layered double hydroxide}, journal = {Journal of Applied Polymer Science}, volume = {130}, number = {6}, year = {2013}, month = {DEC}, pages = {4508-4515}, publisher = {WILEY-BLACKWELL}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

Nonwoven nanofiber mats of polyvinylidene fluoride (PVDF) with modified layered double hydroxide (MLDH) were prepared by electrospinning. The fiber morphology was studied using scanning electron microscopy. X-ray diffraction and FTIR spectroscopy was used to characterize the polymorphism in electrospun mats. Fibers of diameter in the range 80-800 nm with beads of about 2-3 mu m size were observed for pure PVDF, while in case of PVDF/MLDH nanocomposites the number and size of beads were found to be significantly reduced. Uniform and fine nanofibers were obtained at lower content of MLDH, but slightly rough surface was seen for higher content. FTIR and X-ray diffraction patterns signify various crystalline forms of electrospun PVDF. The content of polar -crystalline phase of PVDF, which exhibit piezo and ferroelectric properties was found to be enhanced significantly due to reinforcement of MLDH. Use of these nanofiber mats for heavy metal Cu (II) removal was explored. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4508-4515, 2013

}, keywords = {Adsorption, electrospinning, fibers}, issn = {0021-8995}, doi = {10.1002/app.39729}, author = {Birajdar, Mallinath S. and Wanjale, Santosh D. and Lonkar, Sunil P.} } @article { ISI:000313263300022, title = {Porous-organic-framework-templated nitrogen-rich porous carbon as a more proficient electrocatalyst than Pt/C for the electrochemical reduction of oxygen}, journal = {Chemistry-A European Journal}, volume = {19}, number = {3}, year = {2013}, month = {JAN}, pages = {974-980}, publisher = {WILEY-V C H VERLAG GMBH}, address = {BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY}, abstract = {

Porous nitrogen-rich carbon (POF-C-1000) that was synthesized by using a porous organic framework (POF) as a self-sacrificing host template in a nanocasting process possessed a high degree of graphitization in an ordered structural arrangement with large domains and well-ordered arrays of carbon sheets. POF-C-1000 exhibits favorable electrocatalytic activity for the oxygen-reduction reaction (ORR) with a clear positive shift of about 40 mV in the onset potential compared to that of a traditional, commercially available Pt/C catalyst. In addition, irrespective of its moderate surface area (785 m2?g-1), POF-C-1000 showed a reasonable H2 adsorption of 1.6 wt?\% (77 K) and a CO2 uptake of 3.5 mmol?g-1 (273 K).

}, keywords = {Adsorption, Electrochemistry, fuel cells, oxygen-reduction reaction, porous organic frameworks}, issn = {0947-6539}, doi = {10.1002/chem.201202940}, author = {Pachfule, Pradip and Dhavale, Vishal M. and Kandambeth, Sharath and Kurungot, Sreekumar and Banerjee, Rahul} } @article { ISI:000328443300015, title = {Surface induced collapse of A beta(1-42) with the F19A replacement following adsorption on a single walled carbon nanotube}, journal = {Biophysical Chemistry}, volume = {184}, year = {2013}, month = {DEC}, pages = {108-115}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Spontaneous adsorption of the A beta peptide on the surface of a single-walled carbon nanotube, resulting in the prevention of its intrinsic propensity to form collapsed states, could be a plausible means to hinder the peptide{\textquoteright}s initial nucleation and self-assembly. We report here the effects of sharply reducing both aromatic and hydrophobic character within the peptide{\textquoteright}s central hydrophobic core on its free and surface behavior. In such an altered peptide, complete surface adsorption is found to induce, rather than prevent, the adsorbed peptide{\textquoteright}s collapse. The weakened surface interactions of the central hydrophobic core allow its greater translational mobility on the surface, thereby facilitating interactions that lead to compaction. Both the adsorption and the subsequent collapse are accompanied by a loss of surface hydration in the modified peptide. We further find that such a two-step dewetting leads to hydration levels comparable to that obtained after compaction of the free peptide. These insights may be leveraged for designing molecular surfaces for disrupting intrinsic A beta behavior. (C) 2013 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Amyloid beta peptide, carbon nanotube, Lateral mobility, molecular dynamics simulation, Surface induced collapse}, issn = {0301-4622}, doi = {10.1016/j.bpc.2013.09.008}, author = {Jana, Asis K. and Sengupta, Neelanjana} } @article { ISI:000335706100026, title = {Comparison of polymer induced and solvent induced trypsin denaturation: the role of hydrophobicity}, journal = {Colloids and Surfaces B-Biointerfaces}, volume = {116}, year = {2014}, month = {APR}, pages = {201-205}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Trypsin adsorption from aqueous buffer by various copolymers of allyl glycidyl ether-ethylene glycol dimethacrylate (AGE-EGDM) copolymer with varying crosslink density increases with increasing crosslink density and the effect slowly wears off after reaching a plateau at 50\% crosslink density. The copolymer with 25\% crosslink density was reacted with different amines with alkyl/aryl side chains to obtain a series of copolymers with 1,2-amino alcohol functional groups and varying hydrophobicity. Trypsin binding capacity again increases with hydrophobicity of the reacting amine and a good correlation between logP(octanol) of the amine and protein binding is observed. The bound trypsin is denatured to the extent of 90\% in spite of the presence of hydrophilic hydroxyl and amino groups. The behavior was comparable to that in mixtures of aqueous buffer and water-miscible organic co-solvents where the solvent concentration required to deactivate 50\% of the enzyme (C-50) is dependent on logP(octanol) of the co-solvent. (C) 2014 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Denaturation, Hydrophobicity, Polymer, Trypsin}, issn = {0927-7765}, doi = {10.1016/j.colsurfb.2014.01.002}, author = {Jasti, Lakshmi Swarnalatha and Fadnavis, Nitin W. and Addepally, Uma and Daniels, Siona and Deokar, Sarika Babasaheb and Ponrathnam, Surendra} } @article { ISI:000342525100047, title = {Preparation and characterization of porous fly ash/NiFe2O4 composite: promising adsorbent for the removal of congo red dye from aqueous solution}, journal = {Materials Chemistry and Physics}, volume = {148}, number = {1-2}, year = {2014}, month = {NOV}, pages = {371-379}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

A series of fly ash/NiFe2O4 composites were prepared using fly ash and aqueous solutions of Ni, Fe nitrate salts and NaOH by co-precipitation followed by calcination method. The \% mass ratio of fly ash: NiFe2O4 was varied in the range of 0:100 to 100:0. Samples were characterized by powder XRD, SEM, FTIR and N-2 adsorption-desorption measurements. These samples were further evaluated for their adsorptive performance in removal of Congo red (CR) dye from an aqueous solution. In all the composites, spinel nickel ferrite phase was found to be capable to get anchored with the fly ash surface and exhibited more crystalline nature as compared to pure NiFe2O4 phase. The BET surface area and porous character of the composite were found to increase with the decrease in the contribution of the fly ash, reach to maximum and then decreases on further decrease in fly ash. The composite having \% mass ratio of fly ash: NiFe2O4 = 50:50 exhibited maximum CR adsorption from the aqueous solution on account of the higher BET surface area, more porous character, favorable condition for diffusion of dye molecules and combined effect of chemisorption and physisorption. Under optimum conditions, it has shown the recyclability with adsorption capacity of the magnitude 23.33 mg g(-1), which is much higher than individual fly ash, NiFe2O4 and other composites. The sorption data provided good fit with pseudo-second order kinetic model. The analyses of the adsorption data indicated that, the Langmuir model provides better correlation with the experimental data. (C) 2014 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Composite material, Electron microscopy (SEM), Inorganic compounds, powder diffraction, Precipitation}, issn = {0254-0584}, doi = {10.1016/j.matchemphys.2014.07.057}, author = {Sonar, Shilpa K. and Niphadkar, Prashant S. and Mayadevi, S. and Joshi, Praphulla N.} } @article { ISI:000344379900113, title = {Synthesis of green nano iron particles (GnIP) and their application in adsorptive removal of As(III) and As(V) from aqueous solution}, journal = {Applied Surface Science}, volume = {317}, year = {2014}, month = {OCT}, pages = {1052-1059}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

{The present study reports a new approach to synthesise nano iron particles using leaf extract of Mint (Mentha spicata L.) plant. The synthesised GnIPs were subjected to detailed adsorption studies for removal of arsenite and arsenate from aqueous solution of defined concentration. Iron nanoparticles synthesised using leaf extract showed UV-vis absorption peaks at 360 and 430 nm. TEM result showed the formation of polydispersed nanoparticles of size ranging from 20 to 45 nm. Nanoparticles were found to have core-shell structure. The planer reflection of selected area electron diffraction (SAED) and XRD analysis suggested that iron particles were crystalline and belonged to fcc (face centred cubic) type. Energy-dispersive X-ray analysis (EDAX) shows that Fe was an integral component of synthesised nanoparticles. The content of Fe in nanoparticles was found to be 40\%, in addition to other elements like C (16\%), 0 (19\%) and Cl (23\%). FT-IR study suggested that functional groups like NH

}, keywords = {Adsorption, Arsenate, Arsenite, Iron nanoparticles, kinetics, M. spicata L.}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2014.09.042}, author = {Prasad, Kumar Suranjit and Gandhi, Pooja and Selvaraj, Kaliaperumal} } @article { ISI:000358610200004, title = {Fruit peel waste as a novel low-cost bio adsorbent}, journal = {Reviews in Chemical Engineering}, volume = {31}, number = {4}, year = {2015}, month = {AUG}, pages = {361-381}, publisher = {WALTER DE GRUYTER GMBH}, address = {GENTHINER STRASSE 13, D-10785 BERLIN, GERMANY}, abstract = {

Fruit peel waste (FPW) is abundantly available from the agricultural and food processing industry and has been studied in recent past as an adsorbent. This paper critically reviews the reported work and investigates various FPW-pollutant systems. The study includes statistics of FPW generation, modification, characterization, adsorption ability, recovery/regeneration, and modeling (isotherms, kinetics, and thermodynamics) of batch adsorption. It is found that orange and banana peels are the most extensively studied adsorbents, whereas Pb2+ and methylene blue are the most efficiently removed pollutants, the Langmuir and Freundlich adsorption isotherms provide the best fit in most of the cases, and in general, pseudo-second-order kinetics is followed. There are very limited column studies and no report on commercial plant. Though the reproducibility of the results is poor, FPW has a great potential in the wastewater treatment due to its abundant and cheap availability. FPW can be used for removal of heavy metals and dyes; however, removal of organic and gaseous impurities needs further investigation.

}, keywords = {adsorbent, Adsorption, fruit peel waste, organic and inorganic pollutants, wastewater}, issn = {0167-8299}, doi = {10.1515/revce-2014-0041}, author = {Pathak, Pranav D. and Mandavgane, Sachin A. and Kulkarni, Bhaskar D.} } @article { ISI:000363949300020, title = {Removal of methylene blue (MB) dye from water environment by processed Jowar Stalk [Sorghum bicolor (L.) Moench] adsorbent}, journal = {Clean Technologies and Environmental Policy}, volume = {17}, number = {8}, year = {2015}, month = {DEC}, pages = {2349-2359}, publisher = {SPRINGER}, address = {233 SPRING ST, NEW YORK, NY 10013 USA}, abstract = {

The present paper discusses the results of the study of adsorption of methylene blue on activated carbon, derived from cheap and abundantly available agro-residue of Jowar Stalk (JS) [Sorghum bicolor (L.) Moench] on suitable heat and acid treatment. The physico-chemical and morphological characteristics of processed carbon of JS origin were studied using X-ray diffraction, scanning electron microscopy, Brunauer, Emmett and Teller surface area, and Fourier transform infrared spectrophotometry analyses. The batch studies revealed optimum values of adsorption parameters such as pH, adsorbent dosage, agitation speed, grain size, temperature, and contact time as 7, 1.5 g l(-1), 200 rpm, finer than 75 A mu m, 30 A degrees C, and 7 h, respectively. The adsorption isotherm data were best described by Langmuir isotherm model with a maximum adsorption capacity of 176.05 mg MB g(-1) JS activated carbon at 30 A degrees C, which is higher than that available with adsorbents used by past researchers. In terms of cost-effectiveness, JS carbon shows its superiority over commercially available carbon.

}, keywords = {Adsorption, Isotherms, kinetics, Methylene blue, Processed Jowar Stalk [Sorghum bicolor (L.) Moench]}, issn = {1618-954X}, doi = {10.1007/s10098-015-0977-y}, author = {Dod, Ramesh and Banerjee, Goutam and Saini, D. R.} } @article { ISI:000362736300014, title = {Selective solid-phase extraction of metal for water decontamination}, journal = {Journal of Applied Polymer Science}, volume = {133}, number = {1}, year = {2016}, month = {JAN}, pages = {42849}, publisher = {WILEY-BLACKWELL}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

Metal-contaminated industrial effluent is a major concern for human health. Therefore, the removal of metal is of primary importance. In this study, metals were selectively extracted from water. Selective metal recovery was studied with a crown-ether-based polymer, wherein the selectivity was observed for strontium over lead. Parameters influencing the metal recovery, such as the contact time, adsorbent dosage, and metal-ion concentration, were evaluated. Interestingly, the adsorption rate of strontium was exponentially increased for the initial 4 h, and lead was adsorbed exponentially after 6 h. Notably, 98\% strontium adsorption and 64\% lead adsorption were obtained in 24 h. The Langmuir adsorption isotherm was in good agreement and demonstrated that the reactive sites of the adsorbent were homogeneous with monolayer metal adsorption with an adsorbent. The Freundlich adsorption isotherm was not obeyed by both metals. The pseudo-first-order and pseudo-second-order kinetics indicated that strontium was adsorbed by chemisorption and lead was adsorbed by physisorption. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 132, 42849.

}, keywords = {Adsorption, copolymers, crosslinking, kinetics, radical polymerization}, issn = {0021-8995}, doi = {10.1002/app.42849}, author = {Mane, Sachin and Ponrathnam, Surendra and Chavan, Nayaku} } @article { ISI:000374588500013, title = {Synthesis and characterization of nanoporous silica SBA-15 diaminocyclohexane and its application in removal of Cu(II) and Ni(II) from aqueous solution}, journal = {Desalination and Water Treatment}, volume = {57}, number = {33}, year = {2016}, month = {JUL}, pages = {15397-15409}, publisher = {TAYLOR \& FRANCIS INC}, address = {530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA}, abstract = {

A new nanoporous 1,2-diaminocyclohexane-functionalized SBA-15 (Dach@SBA-15) silica sorbent was prepared. The structure and physicochemical properties of the material were characterized by elemental analysis, X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy, FT-IR spectroscopy, nitrogen adsorption-desorption isotherms and thermogravimetric analysis. TEM image clearly showed the sheet-like structure of Dach@SBA-15. The organic functional groups were successfully grafted onto the SBA-15 surface and the ordering of the support was not affected by the chemical modification. The Dach@SBA-15was used as a sorbent for removal of Cu(II) and Ni(II) from aqueous solution. Experimental parameters like effect of pH, contact time and metal ion concentration were studied and optimized. The adsorption isotherm data fitted well to Langmuir isotherm model and the monolayer adsorption capacity values for Cu(II) was 90.09 and for Ni (II) was 84.03 mg/g at 303 K. The experimental kinetic data fitted very well to the pseudosecond- order model. The Dach@SBA-15 could be used as a sorbent for removal of Cu(II) and Ni(II) from aqueous medium.

}, keywords = {Adsorption, BET, FAAS, FT-IR, Heavy metals, Nanoporous silica}, issn = {1944-3994}, doi = {10.1080/19443994.2015.1072741}, author = {Sreenu, Bhogineni and Sharma, Priti and Seshaiah, Kalluru and Singh, A. P.} } @article { ISI:000371799000029, title = {Utilization of banana peel for the removal of benzoic and salicylic acid from aqueous solutions and its potential reuse}, journal = {Desalination and Water Treatment}, volume = {57}, number = {27}, year = {2016}, month = {JUN}, pages = {12717-12729}, publisher = {TAYLOR \& FRANCIS INC}, type = {Article}, address = {530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA}, abstract = {

We report on the adsorptive removal of benzoic acid (BA) and salicylic acid (SA) using banana peel (BP), an abundantly available agricultural waste material, for the first time. BP was characterized by proximate analysis, FT-IR, scanning electron microscopy, BET surface area, and XRF. The number of basic sites on BP (4.9mmolg(-1)) is relatively more than acidic sites (0.75mmolg(-1)). The Langmuir uptake capacity values obtained are 6.62mgg(-1) for BA and 9.80mgg(-1) for SA. A mechanism for binding acid molecule to the BP surface is proposed.

}, keywords = {Adsorption, Banana peel, Benzoic acids, Salicylic acid, Wastewater treatment}, issn = {1944-3994}, doi = {10.1080/19443994.2015.1051589}, author = {Pathak, Pranav D. and Mandavgane, Sachin A. and Kulkarni, Bhaskar D.} } @article {46155, title = {Adsorptive removal of strontium(II) using macroporous poly(AGE-co-EGDMA) beads modified with resorcin[4]arene}, journal = {Bulletin of Materials Science}, volume = {42}, year = {2019}, month = {APR}, pages = {UNSP 82}, type = {Article}, abstract = {

Adsorption behaviour of strontium(II) on macroporous poly(allyl glycidyl methacrylate-co-ethylene glycol dimethacrylate) [poly(AGE-co-EGDMA)] beads modified with resorcin[4]arene was studied using macroporous cross-linked [poly(AGE-co-EGDMA)] beads. The macroporous crosslinked [poly(AGE-co-EGDMA)] beads were synthesized by suspension polymerization techniques, followed by functionalization with amino derivatives of resorcin[4]arene. The poly(AGE-co-EGDMA) beads were characterized by FTIR, 1H and 13C-NMR, elemental analysis and particle-size analysis. The surface morphology of beads was studied by scanning electron microscopy. The functionalized poly(AGE-co-EGDMA) beads were used as adsorbents for strontium removal. The crucial factors including the effect of pH, time, initial concentration of metal ions and adsorbent dose were investigated to optimize the maximum adsorption efficiency of Sr(II). The equilibrium data of strontium(II) ions adsorbed on functionalized poly(AGE-co-EGDMA) beads were analysed by pseudo-first- and pseudo-second-order kinetic models. The pseudo-second-order kinetic model indicated that strontium was adsorbed by chemisorption.

}, keywords = {Adsorption, AGE-EGDMA beads, resorcin[4]arene, Sr(II)}, issn = {0250-4707}, doi = {10.1007/s12034-019-1786-4}, author = {Mulani, K. and Patil, V. and Chavan, N. and Donde, K.} } @article {46446, title = {Electrocatalysis of oxygen reduction reaction on shape-controlled pt and pd nanoparticles-importance of surface cleanliness and reconstruction}, journal = {Frontiers in Chemistry}, volume = {7}, year = {2019}, month = {OCT}, pages = {648}, type = {Review}, abstract = {

Shape-controlled precious metal nanoparticles have attracted significant research interest in the recent past due to their fundamental and scientific importance. Because of their crystallographic-orientation-dependent properties, these metal nanoparticles have tremendous implications in electrocatalysis. This review aims to discuss the strategies for synthesis of shape-controlled platinum (Pt) and palladium (Pd) nanoparticles and procedures for the surfactant removal, without compromising their surface structural integrity. In particular, the electrocatalysis of oxygen reduction reaction (ORR) on shape-controlled nanoparticles (Pt and Pd) is discussed and the results are analyzed in the context of that reported with single crystal electrodes. Accepted theories on the stability of precious metal nanoparticle surfaces under electrochemical conditions are revisited. Dissolution, reconstruction, and comprehensive views on the factors that contribute to the loss of electrochemically active surface area (ESA) of nanoparticles leading to an inevitable decrease in ORR activity are presented. The contribution of adsorbed electrolyte anions, in-situ generated adsorbates and contaminants toward the ESA reduction are also discussed. Methods for the revival of activity of surfaces contaminated with adsorbed impurities without perturbing the surface structure and its implications to electrocatalysis are reviewed.

}, keywords = {Adsorption, Dissolution, oxygen reduction reaction, Palladium, platinum, reconstruction, shape-control, surface cleaning}, issn = {2296-2646}, doi = {10.3389/fchem.2019.00648}, author = {Devivaraprasad, Ruttala and Nalajala, Naresh and Bera, Bapi and Neergat, Manoj} } @article {46857, title = {Removal of fluoride from aqueous solution by mesoporous silica nanoparticles functionalized with chitosan derived from mushroom}, journal = {Journal of Macromolecular Science Part A-Pure and Applied Chemistry}, volume = {57}, year = {2020}, month = {SEP }, pages = {619-627}, type = {Article}, abstract = {

In the present study, chitosan functionalized mesoporous silica nanoparticles have been synthesized. Chitosan derived from an edible mushroom, Agaricus bisporus was used during synthesis of chitosan functionalized silica nanoparticles. The functionalized silica nanoparticles were subjected to fluoride sorption using a batch method which subsequently showed removal efficiency of 95\% with maximum sorption capacity, 58.8 mg/g. The characterization of nanoparticles was carried out by SEM, EDAX, XRD and FTIR analysis respectively. EDAX analysis suggested that oxygen, 51.83\% and silica 37.24\% was main constituent of the functionalized nanomaterials. XRD yielded characteristic diffraction pattern corresponding to the lattice planes (100), (110), (112), (120), (200) and (220) respectively. Sorption data was used to study equilibrium isotherm namely Langmuir and Freundlich model. The adsorption capacity increased with temperature while kinetics studies revealed that the adsorption process followed a pseudo-second-order rate equation. The enthalpy change (Delta H) and entropy change (Delta S) was found to be -31.36 kJmol(-1) and -7.75 Jmol(-1) K-1, showing endothermic and spontaneous nature of the fluoride adsorption. Data suggested that the nature of adsorption belonged to chemisorptions. The overall results suggested that the synthesized nanoparticles showed strong and specific affinity for fluoride and could be excellent adsorbents for defluoridation.

}, keywords = {Adsorption, Chitosan, EDAX, Fluoride, SEM}, issn = {1060-1325}, doi = {10.1080/10601325.2020.1738896, Early Access Date = MAY 2020}, author = {Srivastava, Anushree and Kumari, Madhu and Ramanathan, Alagappan and Selvaraj, Kaliaperumal and Prasad, Bablu and Prasad, Kumar Suranjit} } @article {46626, title = {Adsorption of toxic Pb(II) on activated carbon derived from agriculture waste (Mahogany fruit shell): isotherm, kinetic and thermodynamic study}, journal = {International Journal of Environmental Analytical Chemistry}, volume = {102}, year = {2022}, month = {DEC}, pages = {8270-8286}, type = {Article}, abstract = {

An adsorbent, mahogany fruit shell activated carbon(MFSAC), was derived from environmental friendly raw material, i.e. agriculture waste and explored for bench scale adsorption of toxic Pb(II). A facile MFSAC material was synthesised using a chemical activation method using concentrated sulphuric acid as an impregnating (activating) reagent. So derived adsorbent material was characterised by FTIR, XRD, BET, SEM, EDAX, TGA and XPS techniques to know the properties and plausible adsorption mechanism. Bench scale adsorption of toxic Pb(II) and maximum adsorption capacity of MFSAC were exhibited through batch adsorption experiments. The effect of physico-chemical parameters such as pH (1-7), MFSAC amount (0.5-5.0 g L-1), Pb(II) concentration (200-1000 mgL(-1)), contact period (60-600 min) and orbital shaking speed (60-200 rpm) was studied for maximum removal of Pb(II) upto 99.70 +/- 0.17\%. The experimental data follow the Langmuir adsorption isotherm with a maximum monolayer adsorption capacity 322.28 mg g(-1)and pseudo-second-order kinetic uptake rate. The thermodynamic and temperature study revealed that the adsorption process was spontaneous and endothermic in nature (Delta H-o = 43.37 kJ mole(-1), Delta S-o = 158.02 J mol(-1)K(-1)). Most importantly, the MFSAC adsorbent was successfully regenerated and reused with conspicuous performance up to five consecutive cycles. The bench-scale adsorption with simple synthesis route, good stability and remarkable regeneration capability makes the MFSAC as an encouraging adsorbent for wastewater treatment.

}, keywords = {activated carbon, Adsorption, mahogany fruit shell, Pb(II), sulphuric acid}, issn = {0306-7319}, doi = {10.1080/03067319.2020.1849648}, author = {Patil, Suryakant A. and Suryawanshi, Umesh P. and Harale, Namdev S. and Patil, Sandip K. and Vadiyar, Madgonda M. and Luwang, Meitram N. and Anuse, Mansing A. and Kim, Jin H. and Kolekar, Sanjay S.} } @article {48369, title = {Developing spherical activated carbons from polymeric resins for removal of contaminants from aqueous and organic streams}, journal = {International Journal of Environmental Science and Technology}, volume = {19}, year = {2022}, month = {OCT}, pages = {10021-10040}, type = {Article}, abstract = {

Spherical activated carbons from polymer resin were developed with metal modifications, before/after carbonization using copper and nickel, for gradation of zeta potential (-5.01 to 8.64 mV) and high metal loading (up to 12.3\%). The materials provide improved removal of various contaminants from aqueous and organic streams-removal of bacteria from water and sulfur removal from fuel. The metal-modified spherical activated carbons were highly effective for removal of both gram-negative E. coli and gram-positive S. aureus bacteria. The copper-modified spherical activated carbon could eliminate 99.9-100\%, both bacterial content proving efficacy in water disinfection with a very high rate similar to 1.33 x 10(5) (CFU/ml.s). The zeta potential has significant impact with higher disinfection for high values; similar to 10-15\% disinfection can be improved up to 100\% for zeta potential changes from -5 to 8.6 mV. Kinetics of disinfection was studied by accounting for zeta potential in the conventional rate model, and the efficacy of both the models was compared. The fit of revised model was excellent. The spherical activated carbons can be useful for removal of slightly polar contaminants from organic streams and a high capacity of 12.8, 20 and 28 mgS/g for thiophene, benzothiophene and dibenzothiophene, respectively. The developed materials can provide useful applications in the area of environmental pollution control. [GRAPHICS] .

}, keywords = {Adsorption, Material, pollution, Sulfur removal, Water disinfection}, issn = {1735-1472}, doi = {10.1007/s13762-021-03684-6}, author = {Mane, M. B. and Bhandari, V. M.} } @article {48130, title = {Hybrid material for ferric ion detection \& remediation: exceptional selectivity \& adsorption capacity with biological applications}, journal = {Microporous and Mesoporous Materials}, volume = {338}, year = {2022}, month = {JUN}, pages = {111945}, type = {Article}, abstract = {

In this work, naphthalimide derived functionalized silica material SiO2@NAPIA (2,2{\textquoteright}((((propylazanediyl)bis (methylene))bis(2,1-phenylene))bis(oxy))bis(N-(1,3-dioxo-1H-benzo[de]i soquinoline-2(3H)-yl)acetamide)) was constructed as a dual signaling and remediation material for ferric ions from a pool of 35 common ions (cations and anions) in the aqueous system. The material Cubic SiO2 shows a high surface area (1104 m2/g, pore volume (1.510 cm3/g), and pore diameter (6.3 nm) in the mesoporous range, which reduces further on functionalization to get the final material SiO2@NAPIA. The ferric ion selectivity through fluorescence quenching displays a SternVolmer quenching constant (Ksv) of 7.8 x 108 M-1 with a LOD (Limit of detection) value of 0.11 mu M for ferricion, which is 48 times lower than the USEPA (United States Environmental Protection Agency) maximum contaminant level (5.35 mu M) in drinking water. This material also shows a very high adsorption capacity (664 mg/g) for ferric ions fitting the Langmuir model isotherm with R2 = 0.99, which can be easily stripped out, and the material can be recycled. This material was also used as a sensory probe material for biosensing of ferric ions through fluorescence imaging in living organisms like Artemia salina and quantification in the real environmental sample. Furthermore, the antibacterial activity inspired by the ferric ion chelating affinity shows good potency against several Gram-negative and Gram-positive bacterial strains. The Minimum Inhibitory Concentration (MIC) \& Minimal Bactericidal Concentration (MBC) of the material against these pathogens were found to be 100 \& 200 mu g/mL respectively. This material signifies superior activity with respect to the ferric-ion selective materials known in the literature.

}, keywords = {Adsorption, Antibacterial, Biosensing, Functional material, Mesoporous silica, sensing}, issn = {1387-1811}, doi = {10.1016/j.micromeso.2022.111945}, author = {Yadav, Sanjay and Rajpurohit, Dushyantsingh and Dash, Soumya Ranjan and Bhojani, Gopal and Chatterjee, Shruti and Paital, Alok Ranjan} } @article {48268, title = {Chemically modified graphene sheets as potential sensors for organophosphate compounds(pesticide): A DFT study}, journal = {Applied Surface Science}, volume = {619}, year = {2023}, month = {MAY}, pages = {156745}, type = {Article}, abstract = {

Owing to the extensive use of pesticides in agriculture and the threat posed to the environment and humankind, attention is drawn toward the need for its remediation from various sources, in particular from water. The adsorption characteristics of hydrophobic graphene and its BN doped counterparts are evaluated using DFT methodology, to assess their sensing potential towards notable pesticide molecules (Organophosphate pesticides (OPs) such as chlorpyriphos, parathion, methyl-parathion, and fenitrothion). To accomplish this, various elec-tronic properties such as band structure, DOS, Bader charge analysis, and CDD have been calculated. Interest-ingly, exothermic interactions (-0.1 eV to-2 eV) have been noted for all the OPs with NB doped single vacancy defect induced graphene surfaces. With an exception of FTN, all the other OPs showed significant changes in the electronic properties of surfaces as apparent from the change in band gap and nature of the band from indirect to direct. The appreciable adsorption energy, higher charge transfer, and notable variation in the band gap are the decisive factors behind the strong interaction exhibited by NB doped surfaces especially dg-(NB-2)2 (except FTN). These findings demonstrate the suitability of NB doped single vacancy defect induced graphene sheets for the detection of the studied OPs.

}, keywords = {Adsorption, BN doped graphene surfaces, Charge density difference, Density functional theory, Organophosphate pesticides}, issn = {0169-4332}, doi = {10.1016/j.apsusc.2023.156745}, author = {Shivankar, Bhavana R. and Singh, Chandrodai Pratap and Krishnamurty, Sailaja} } @article {48915, title = {Development of multipurpose biomass-derived adsorbents using Coccinia grandis for removal of contaminants}, journal = {Clean Technologies and Environmental Policies }, volume = {25}, year = {2023}, month = {DEC}, pages = {3393-3405}, type = {Article}, abstract = {

The present study is an attempt to develop newer multipurpose biomass-derived adsorbents for water and wastewater treatment; biomass that are easily available, renewable and most importantly, sustainable. A model adsorbent was developed using Coccinia grandis (CG, Ivy gourd) and further modified by impregnating copper nanoparticles (CG-Cu). The adsorbent characterization was done for evaluating surface morphology, surface area and metal modification. The utility of the newer adsorbents was established for the removal of different contaminants such as dyes (cationic Malachite Green, anionic Congo Red and fluorescent cationic Rhodamine B), Active Pharmaceutical Ingredient pollutant (Ciprofloxacin) and also for the removal of pathogenic bacteria, Gram-negative Escherichia coli. Both CG and CG-Cu bio-nanocomposite were highly effective in removal of different contaminants, 99\% dye removal for Malachite Green, with a high adsorption capacity of 49 mg/g, higher than that for commercial activated charcoal whereas for all other dyes, the performance of CG-Cu was similar. The isotherm studies indicated multilayer adsorption, in general. A good adsorption capacity of 10.8 mg/g was also observed for the removal of ciprofloxacin. The combined effect of the bio-nanocomposite, CG-Cu was impressive and 100\% disinfection was achieved within 10 min, due to the antimicrobial activity of Cu and oxidation effect of reactive oxygen species enhancing the disinfection.Graphical abstractMultipurpose biomass derived adsorbents using Coccinia grandis for removal of contaminants

}, keywords = {Adsorption, Biomass, Disinfection, dye removal, nanomaterial, Separation}, issn = {1618-954X}, doi = {10.1007/s10098-023-02598-w}, author = {Raj, Surabhi S. and Mane, Maya B. and Thanekar, Pooja and Balapure, Kshama and Bhandari, Vinay M.} } @article {49295, title = {Continuous flow synthesis of hierarchical low silica X zeolite}, journal = {Materials Today Communications}, volume = {39}, year = {2024}, month = {JUN}, pages = {109047}, type = {Article}, abstract = {

Zeolites, renowned for their versatile applications in catalysis, adsorption, and ion exchange, have long been synthesized using conventional batch processes. However, the inherent limitations of these methods, such as resource-intensive conditions and inconsistent product quality, underscore the need for a sustainable and efficient approach. In this study, a continuous flow synthesis process was established for the synthesis of industrially important low silica X (LSX) zeolite using a tubular reactor. The synthesis gel was subjected to aging for 5 days at room temperature to facilitate nucleation and crystal growth combined with the fast-heating rate in a tubular reactor at 363 K \& 1.1 atm., which in turn produces LSX after 40 min. The synthesized product was confirmed by the XRD, FE-SEM, EDS, XRF, TEM, and N2 adsorption-desorption; the data was compared with the LSX sample synthesized by batch process. The result implies that LSX prepared by continuous flow has a pure phase of LSX with the hierarchical structure, which provides better adsorption capacity of CO2 at 298 K up to 20 bar. Due to continuous flow synthesis, the crystallization time was reduced and faster kinetics which may be helpful for scale-up the process for LSX synthesis.

}, keywords = {Adsorption, Carbon dioxide, continuous flow, Low silica X, Tubular reactor, zeolites}, doi = {10.1016/j.mtcomm.2024.109047}, author = {Adarsh, V. K. and Shrotri, Aadesh R. and Birje, Amit R. and Nandanwar, Sachin U.} } @article {49362, title = {Indazole-5-amine (AIA) as competing corrosion coating to Benzotriazole (BTAH) at the interface of Cu: A DFT and BOMD case study}, journal = {Computational and Theoretical Chemistry}, volume = {1239}, year = {2024}, month = {SEP}, pages = {114762}, type = {Article}, abstract = {

This study compares three organic compounds-benzotriazole (BTAH), imidazole (IM), and indazole-5-amine (AIA)-as corrosion inhibitors for copper substrates. Using Density Functional Theory (DFT) and Born-Oppenheimer Molecular Dynamics (BOMD) calculations, it identifies AIA as a promising and cost-effective alternative to the toxic BTAH. The adsorption strength on Cu(1 0 0) surfaces is ranked AIA\>BTAH\>IM for both neutral and deprotonated forms. These findings are supported by electronic parameter studies, including Bader charge analysis, density of states (DOS), charge density differences (CDD), and frontier molecular orbital analysis. AIA shows the best adsorption in a parallel orientation at the top site. Packing studies reveal that hydrogen bonding stabilizes the interaction energies within self-assembled AIA aggregates. Organometallic complexation studies reveal that deprotonated BTAH exhibits higher interaction energy with a single Cu atom compared to AIA when bonded through the carbon end, consistent with the findings from BOMD studies. However, on periodic Cu surfaces, AIA outperforms BTAH molecules as seen from adsorption energies. This investigation highlights AIA{\textquoteright}s potential as a superior and more economical corrosion inhibitor for copper.

}, keywords = {Adsorption, Born-Oppenheimer molecular dynamics, Corrosion inhibition, Density functional theory, Indazole derivatives}, issn = {2210-271X}, doi = {10.1016/j.comptc.2024.114762}, author = {Samal, Pragnya Paramita and Singh, Chandrodai Pratap and Tiwari, Shivani and Shah, Vaishali and Krishnamurty, Sailaja} } @article {49236, title = {Nanotrap infused ultrathin hybrid composite material for rapid and highly selective entrapment of 99TcO4-}, journal = {CHEMICAL SCIENCE}, volume = {15}, year = {2024}, month = {NOV}, pages = {18463-18475}, type = {Journal Article}, keywords = {Adsorption, CAPTURE, EFFICIENT, Metal-organic framework, Removal, TECHNETIUM}, issn = {2041-6520}, doi = {10.1039/d4sc04010d}, author = {Mandal, Writakshi and Fajal, Sahel and Majumder, Dipanjan and Sengupta, Arijit and Let, Sumanta and Urkude, Rajashri R. and Shirolkar, Mandar M. and Torris, Arun and Ghosh, Sujit K.} } @article {49022, title = {Performance of Li exchange hierarchical X zeolite for CO2 adsorption and H2 separation}, journal = {Journal of Industrial and Engineering Chemistry }, volume = {133}, year = {2024}, month = {MAY }, pages = {505-514}, type = {Article}, abstract = {

Li exchange hierarchical X zeolite (Li-H-X) was prepared by decationization of X zeolite by NH4Cl solution followed by Li exchange and subsequent calcination. NH4-X and Li-X were prepared to compare the results of LiH-X. XRD, FE-SEM, EDS, N2 adsorption-desorption, and micro-/mesoporous volume were performed. The higher mesoporosity was confirmed in Li-H-X due to the framework dealumination during decationization. Static and dynamic sorption capacity of sorbents was evaluated to identify the performance of sorbent. The CO2 and H2 equilibrium adsorption capacity of Li-H-X was found to be 9.6 mmol g-1 and 0.78 mmol g-1, respectively, at 298 K and 20 bar, which was 25 \% (CO2) and 30 \% (H2) higher than Li-X. Static experimental data were validated using the Langmuir, Freundlich, and Sips models. The CO2 \& H2 dynamic sorption capacity of Li-H-X sorbent for binary gas (CO2/H2, 25/75 \%) was 4.145 mmol g-1 and 0.258 mmol g-1 at 303 K and 10 bar. The higher sorption capacity of Li-H-X was obtained due to large micro-/mesoporous volume of sorbent, which may allow to access unoccupied sites at higher pressure. This result reveals that micro-/mesoporous structure of zeolite adsorbs significantly higher CO2 from binary gas stream, which can use to separate pure H2 from gas stream.

}, keywords = {Adsorption, Carbon dioxide, Hydrogen, Microporous-mesoporous, Separation}, issn = {1226-086X}, doi = {10.1016/j.jiec.2023.12.027}, author = {Shrotri, Aadesh R. and Birje, Amit R. and Niphadkar, Prashant S. and V. Bokade, Vijay and Mali, Nilesh A. and Nandanwar, Sachin U.} } @article {49811, title = {Synthesis of Core-Shell ETS-4@LSX zeolite composite to enhance CO2/N2 selectivity in flue gas separation}, journal = {Microporous and Mesoporous Materials}, volume = {399}, year = {2026}, month = {JAN }, pages = {113840}, type = {Article}, abstract = {

The selective removal of CO2 from the flue gas remains a quite challenging due to the weak selectivity of CO2/N2 in adsorbents. Therefore, it is necessary to design an effective sorbent to improve its selectivity. This work attempts to synthesis of novel core-shell ETS-4@LSX composite via a seed-assisted hydrothermal method. In this composite structure, a small pore titanosilcate ETS-4 as a core, while a large pore aluminosilicate LSX forms the outer shell. The effects of ETS-4 seed loading (1-5 wt.\%) and crystallization time on the formation and structural integrity of the core-shell architecture was systematically investigated. The structural and physicochemical properties of samples were characterized by XRD, FE-SEM, HR-TEM, EDS, FT-IR, TGA, N2 adsorption-desorption, and pore size distribution. From XRD pattern and FE-SEM results confirmed that the composite synthesized with 2 wt\% ETS-4 seed and 3 h crystallization time has pure phase of ETS-4@LSX structure. HR-TEM imaging revealed uniform growth of LSX over the ETS-4 surface, resulting in the formation of a continuous shell. The 2 wt\% ETS4@LSX composite demonstrated an outstanding CO2/N2 equilibrium selectivity of 81.4 at 1 bar and 303 K with five and seven times higher than that of pure LSX and ETS-4, respectively. At 20 bar, the composite achieved a CO2 uptake of 5.25 mmol g- 1 and an N2 uptake of 0.50 mmol g- 1. Dynamic adsorption study exhibited the 2 wt\% ETS-4@LSX has 3.52 mmol g- 1 CO2 sorption capacity and N2 uptake capacity of 0.26 mmol g- 1. The enhanced adsorption capacity and selectivity of ETS-4@LSX are attributed to its dual-pore structure, highlighting its potential as an effective adsorbent for CO2 capture from flue gas.

}, keywords = {Adsorption, Core-shell composite, Dual-pore structure, ETS-4, Flue gas, LSX}, issn = {1387-1811}, doi = {10.1016/j.micromeso.2025.113840}, author = {Birje, Amit R. and Shrotri, Aadesh R. and Nandanwar, Sachin U.} }