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-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-001729nas a2200229   4500008004100000022001400041245011900055210006900174260007300243300001200316490000800328520090100336653001301237653001701250653001401267653001301281653001801294100001901312700002201331700001701353856012901370       2012                        eng d  a1387-181100aAlginate and hydrotalcite-like anionic clay composite systems: synthesis, characterization and application studies0 aAlginate and hydrotalcitelike anionic clay composite systems syn  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a241-2460 v1583 a<p>Hydrotalcite-like anionic clays (Zn/Al and Mg/Al) were intercalated with sodium alginate to form organic-inorganic composite adsorbents for water treatment applications. The synthesized composites were characterized using different characterization techniques viz. XRD, DRIFTS, SEM and surface area/porosity analysis. The adsorption potential of the alginate-clay composites was examined for removal of fluoride ions and Orange II dye from water by adsorption. Our studies revealed that these composites had high adsorption capacity for the adsorption of fluoride and Orange II dye from aqueous solutions. The adsorption capacity of the composites was considerably higher than that of either alginate or clay, used individually. The results indicated that these materials might be useful sorbents for groundwater purification/effluent treatment. (C) 2012 Elsevier Inc. All rights reserved.</p>10aAlginate10aAnionic clay10aComposite10aFluoride10aOrange II dye1 aMandal, Sujata1 aPatil, Varsha, S.1 aMayadevi, S.  uhttps://library.ncl.res.in/content/alginate-and-hydrotalcite-anionic-clay-composite-systems-synthesis-characterization-and-0