01451nas a2200205   4500008004100000022001400041245006700055210006600122260007300188300001000261490000700271520075900278653001501037653001701052653001301069653002901082100001901111700001701130856009801147       2008                        eng d  a0169-131700aAdsorption of fluoride ions by Zn-Al layered double hydroxides0 aAdsorption of fluoride ions by ZnAl layered double hydroxides  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJUN  a54-620 v403 a<p>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.</p>10aAdsorption10aAnionic clay10aFluoride10aLayered double hydroxide1 aMandal, Sujata1 aMayadevi, S.  uhttps://library.ncl.res.in/content/adsorption-fluoride-ions-zn-al-layered-double-hydroxides-001754nas a2200205   4500008004100000022001400041245010300055210006900158260010600227300001200333490000700345520096500352653001501317653001401332653001301346653002901359100001901388700001701407856012401424       2008                        eng d  a0045-653500aCellulose supported layered double hydroxides for the adsorption of fluoride from aqueous solution0 aCellulose supported layered double hydroxides for the adsorption  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUN  a995-9980 v723 a<p>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.</p>10aAdsorption10acellulose10aFluoride10aLayered double hydroxide1 aMandal, Sujata1 aMayadevi, S.  uhttps://library.ncl.res.in/content/cellulose-supported-layered-double-hydroxides-adsorption-fluoride-aqueous-solution-001796nas a2200229   4500008004100000022001400041245011900055210006900174260007300243300001200316490000800328520098000336653001501316653001701331653001301348653001301361653001301374653001701387100001901404700001701423856012601440       2009                        eng d  a0304-389400aDefluoridation of water using as-synthesized Zn/Al/Cl anionic clay adsorbent: equilibrium and regeneration studies0 aDefluoridation of water using assynthesized ZnAlCl anionic clay   aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a873-8780 v1673 a<p>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.</p>10aAdsorption10aAnionic clay10aFluoride10aIsotherm10akinetics10aRegeneration1 aMandal, Sujata1 aMayadevi, S.  uhttps://library.ncl.res.in/content/defluoridation-water-using-synthesized-znalcl-anionic-clay-adsorbent-equilibrium-and-001572nas a2200229   4500008004100000022001400041245008500055210006900140260008600209300001800295490000700313520076700320653001501087653001101102653001201113653002901125100002001154700002501174700001901199700001701218856010701235       2011                        eng d  a0149-639500aAdsorption of cresols on zinc-aluminium hydroxides - a comparison with zeolite-X0 aAdsorption of cresols on zincaluminium hydroxides a comparison w  a530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcJAN  aPII 9343050340 v463 a<p>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.</p>10aAdsorption10acresol10azeolite10azinc-aluminium hydroxide1 aVijayakumar, J.1 aChikkala, Suresh, K.1 aMandal, Sujata1 aMayadevi, S.  uhttps://library.ncl.res.in/content/adsorption-cresols-zinc-aluminium-hydroxides-comparison-zeolite-x-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<p>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.</p>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-0