02739nas a2200265 4500008004100000022001400041245009000055210006900145260007300214300001200287490000800299520182300307653001702130653001902147653001902166653001302185653001502198653002002213100002602233700002802259700002702287700001902314700002302333856011702356 2010 eng d a0926-860X00aVanadia-titania thin films for photocatalytic degradation of formaldehyde in sunlight0 aVanadiatitania thin films for photocatalytic degradation of form aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB a103-1090 v3743 a

Thin films of vanadia-titania with good adhesion to the substrates have been deposited on various substrates such as glass slides, glass helix and silica raschig rings by simple sol-gel dip coating process using vanadium and titanium peroxide gel. The optimum concentration of vanadia in titania for obtaining good uniform viscous gel was found to be 0.5-4 wt% beyond which the vanadia particles disturb the gel network, resulting in the formation of a gelatinous precipitate. The films of vanadia-titania as well as the dried powder of the bulk gel were characterized by different characterization techniques. Optical characterization by UV-vis spectrophotometer showed a shift in optical absorption wavelength to the visible region that may be due to the incorporation of vanadia into titania structure. The XRD revealed the formation of anatase phase in pure titania as well as titania with up to 2% vanadia loading, whereas formation of rutile as minor phase along with anatase as major phase was observed at higher vanadia loading. The XRD did not show any peaks of vanadia phase up to 5% vanadia loading indicating either incorporation of vanadia into titania structure or high dispersion of amorphous vanadia on titania support. The pure and vanadia doped TiO(2) thin films were evaluated for their photocatalytic activity for degradation of methylene blue as a model pollutant under sunlight. Doping Of V(2)O(5) in TiO(2) showed an increase in the photo-degradation rate of methylene blue by a factor of 3-6.6 times compared to pure TiO(2). The highest rate has been obtained for 4% V(2)O(5)-doped TiO(2) films. Vanadia doped TiO(2) thin films were also found to be very active for photocatalytic degradation of formaldehyde from aqueous solution in sunlight. (c) 2009 Elsevier B.V. All rights reserved.

10aFormaldehyde10aMethylene blue10aPhotocatalysis10aSunlight10aThin films10aV(2)O(5)/TiO(2)1 aAkbarzadeh, Rokhsareh1 aUmbarkar, Shubhangi, B.1 aSonawane, Ravindra, S.1 aTakle, Srikant1 aDongare, Mohan, K. uhttps://library.ncl.res.in/content/vanadia-titania-thin-films-photocatalytic-degradation-formaldehyde-sunlight-002302nas a2200265 4500008004100000022001400041245013100055210006900186260014500255300001200400490000700412520130500419653001501724653002401739653001501763653002101778653001401799653001301813653001901826653001101845100001601856700002101872700001401893856012901907 2012 eng d a1226-837200aAdsorption of methylene blue using green pea peels (Pisum sativum): a cost-effective option for dye-based wastewater treatment0 aAdsorption of methylene blue using green pea peels Pisum sativum aKOREAN SCIENCE TECHNOLOGY CENTER, \#704 YEOGSAM-DONG, KANGNAM-KU, SEOUL 135-703, SOUTH KOREAbKOREAN SOC BIOTECHNOLOGY & BIOENGINEERINGcAUG a862-8740 v173 a

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.

10aAdsorption10aDubinin-raduskevich10aFreundlich10agreen peas peels10aIsotherms10aLangmuir10aMethylene blue10aTemkin1 aDod, Ramesh1 aBanerjee, Goutam1 aSaini, S. uhttps://library.ncl.res.in/content/adsorption-methylene-blue-using-green-pea-peels-pisum-sativum-cost-effective-option-dye-002179nas a2200265 4500008004100000022001400041245014500055210006900200260007400269300000900343490000800352520117700360653001501537653001801552653001901570653002101589653002801610100002201638700002101660700002801681700002501709700002601734700002401760856012901784 2013 eng d a0049-697900aEnhanced dual-effect of adsorption and photodegradation of SiO2 embedded TiO2 hybrid catalyst for improved decolourization of methylene blue0 aEnhanced dualeffect of adsorption and photodegradation of SiO2 e aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcSEP a17260 v2243 a

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.

10aAdsorption10akinetic model10aMethylene blue10aPhotodegradation10aSilica embedded titania1 aSonar, Shilpa, K.1 aWagh, Reshma, V.1 aNiphadkar, Prashant, S.1 aJoshi, Praphulla, N.1 aDeshpande, Shilpa, S.1 aAwate, Shobhana, V. uhttps://library.ncl.res.in/content/enhanced-dual-effect-adsorption-and-photodegradation-sio2-embedded-tio2-hybrid-catalyst-002039nas a2200265 4500008004100000022001400041245008600055210006900141260010600210300001200316490000800328520112000336653001101456653000901467653001901476653002501495100002001520700001901540700001801559700001801577700001801595700001901613700002101632856012001653 2014 eng d a0038-092X00aSolar photocatalytic degradation of methylene blue using doped TiO2 nanoparticles0 aSolar photocatalytic degradation of methylene blue using doped T aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcMAY a473-4790 v1033 a

Doped-TiO2 nanoparticles (M:TiO2: Fe, Zn, Zr, Sb, Ce and nM:TiO2: B, C, N, P, S) with anatase structure were prepared by sol-gel method and characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), Brunauer-Teller method (BET), UV-Vis diffuses reflectance spectroscopy (DRS). Results revealed that the anatase structure is highly stable for all doped TiO2 prepared compounds with enhancement in the surface area. UV-Vis diffuse reflectance spectra showed that these dopants were responsible for narrowing the band gap of TiO2 and shifting its optical response from ultraviolet to visible-light region. The photocatalytic activities of these multi-doped TiO2 catalysts were investigated by degradation methylene blue in aqueous solution under solar-light illumination. The results showed an appreciable enhancement in the photoactivity of the C-doped TiO2 as compared to other multi-doped TiO2 because of the formation of Ti+3 species which prevent the recombination of electron-hole pairs in C-doped TiO2. (C) 2014 Elsevier Ltd. All rights reserved.

10aCarbon10airon10aMethylene blue10aSolar photocatalysis1 aBhosale, R., R.1 aPujari, S., R.1 aMuley, G., G.1 aPatil, S., H.1 aPatil, K., R.1 aShaikh, M., F.1 aGambhire, A., B. uhttps://library.ncl.res.in/content/solar-photocatalytic-degradation-methylene-blue-using-doped-tio2-nanoparticles-001973nas a2200229 4500008004100000022001400041245012700055210006900182260005700251300001400308490000700322520111300329653001501442653001401457653001301471653001901484653005601503100001601559700002101575700001801596856012901614 2015 eng d a1618-954X00aRemoval of methylene blue (MB) dye from water environment by processed Jowar Stalk [Sorghum bicolor (L.) Moench] adsorbent0 aRemoval of methylene blue MB dye from water environment by proce a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcDEC a2349-23590 v173 a

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.

10aAdsorption10aIsotherms10akinetics10aMethylene blue10aProcessed Jowar Stalk [Sorghum bicolor (L.) Moench]1 aDod, Ramesh1 aBanerjee, Goutam1 aSaini, D., R. uhttps://library.ncl.res.in/content/removal-methylene-blue-mb-dye-water-environment-processed-jowar-stalk-sorghum-bicolor-l-102701nas a2200265 4500008004100000022001400041245016000055210006900215260000800284300001100292490000800303520172400311653003002035653003202065653001702097653001902114653003702133100002202170700001902192700001702211700002502228700002602253700002702279856012902306 2020 eng d a0304-389400aUnravelling the distinct surface interactions of modified graphene nanostructures with methylene blue dye through experimental and computational approaches0 aUnravelling the distinct surface interactions of modified graphe cAPR a1217550 v3883 a

Nanoscopic modifications leading to multi-dimensional graphene structures are known to significantly influence their candidature for several applications including catalysis, energy storage, molecular sensing and most significantly adsorption and remediation of harmful materials such as dyes. The present work attempts to identify the key trajectories that connect the structural qualification with a chosen application, viz., the interactive forces in dye remediation. Various physico-chemically Modified Graphene Nanostructures (MGNs) such as 2 dimensional Graphite, Graphene Oxide (GO), reduced GO (rGO), holey rGO, and 3 dimensional GO hydrogel and Holey GO hydrogel are chosen and synthesised herein. These represent varieties of physicochemical features with respect to their dimensionality, surface features such as oxygen functionality, nanoscopic holes etc., that contribute to their characteristic overall surface interactions. Methylene Blue (MB), a popular industrial effluent posing major environmental concern is chosen to be a probe adsorbate in this case study. An exclusive real time in-situ UV visible spectral experiment provides the revealing reasons behind the outstanding performance of 2D GO sheets with an adsorption capacity of greater than 92 % even at high MB concentrations (>2000 ppm). A complex dependency of various factors such as surface oxygen, morphology, nanoporosity etc. on the unique overall interaction with an adsorbent such as MB by all these adsorbates is demonstrated using experimental and DFT based computational studies. Electrostatics and hydrogen bonding are understood to be the two dominant forces driving the MB adsorption on the best performing GO here.

10aDensity functional theory10aIn-situ UV-vis spectroscopy10aInteractions10aMethylene blue10aModified Graphene Nanostructures1 aManappadan, Zinoy1 aKumar, Shubham1 aJoshi, Krati1 aGovindaraja, Thillai1 aKrishnamurty, Sailaja1 aSelvaraj, Kaliaperumal uhttps://library.ncl.res.in/content/unravelling-distinct-surface-interactions-modified-graphene-nanostructures-methylene-blue