02179nas 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-002581nas a2200253 4500008004100000022001400041245014900055210006900204260006900273300001200342490000800354520161400362653001501976653002301991653003002014653002402044653002302068653001802091100002202109700002802131700001702159700002502176856012602201 2014 eng d a0254-058400aPreparation and characterization of porous fly ash/NiFe2O4 composite: promising adsorbent for the removal of congo red dye from aqueous solution0 aPreparation and characterization of porous fly ashNiFe2O4 compos aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcNOV a371-3790 v1483 a

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.

10aAdsorption10aComposite material10aElectron microscopy (SEM)10aInorganic compounds10apowder diffraction10aPrecipitation1 aSonar, Shilpa, K.1 aNiphadkar, Prashant, S.1 aMayadevi, S.1 aJoshi, Praphulla, N. uhttps://library.ncl.res.in/content/preparation-and-characterization-porous-fly-ashnife2o4-composite-promising-adsorbent-002167nas a2200265 4500008004100000022001400041245009100055210006900146260000900215300001200224490000800236520130800244653001501552653001901567653001301586653002701599653001501626100002401641700002001665700002801685700002201713700002101735700002601756856011901782 2024 eng d a1226-086X00aPerformance of Li exchange hierarchical X zeolite for CO2 adsorption and H2 separation0 aPerformance of Li exchange hierarchical X zeolite for CO2 adsorp cMAY  a505-5140 v1333 a

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.

10aAdsorption10aCarbon dioxide10aHydrogen10aMicroporous-mesoporous10aSeparation1 aShrotri, Aadesh, R.1 aBirje, Amit, R.1 aNiphadkar, Prashant, S.1 aBokade, Vijay, V.1 aMali, Nilesh, A.1 aNandanwar, Sachin, U. uhttps://library.ncl.res.in/content/performance-li-exchange-hierarchical-x-zeolite-co2-adsorption-and-h2-separation