02122nas a2200253   4500008004100000022001400041245011600055210006900171260007300240300001200313490000800325520121300333653002301546653001301569653002201582653002401604653001301628100001701641700001801658700001901676700002601695700002001721856012701741       2012                        eng d  a0304-389400aAlumina supported carbon composite material with exceptionally high defluoridation property from eggshell waste0 aAlumina supported carbon composite material with exceptionally h  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a161-1690 v2373 a<p>A new alumina supported carbon composite material called ``Eggshell Composite'' (EC) was synthesized from eggshell waste as calcium source for selective fluoride adsorption from water. The effect of various synthesis parameters like eggshell (ES): Eggshell membrane (ESM) ratio, aluminium loading, mixing time and calcinations temperature to optimize the synthesis conditions for selective fluoride removal has been studied. It was observed that the synthesis parameters have significant influence on development of EC and in turn on fluoride removal capacity. EC synthesized was characterized for elemental composition, morphology, functionality and textural properties. Results showed that EC obtained from eggshell modified with alumina precursor is more selective and efficient for fluoride removal. Langmuir and Freundlich isotherm were used to obtain ultimate fluoride removal capacity. The calcium and alumina species in EC shows synergistic effect in fluoride adsorption process. Fluoride sorption studies were carried out in synthetic, groundwater and wastewater. EC proved to be a potential, indigenous and economic adsorbent for fluoride removal. (C) 2012 Elsevier B.V. All rights reserved.</p>10aComposite material10aEggshell10aEggshell membrane10aFluoride adsorption10aLangmuir1 aLunge, Sneha1 aThakre, Dilip1 aKamble, Sanjay1 aLabhsetwar, Nitin, K.1 aRayalu, Sadhana  uhttp://library.ncl.res.in/content/alumina-supported-carbon-composite-material-exceptionally-high-defluoridation-property-002177nas a2200241   4500008004100000022001400041245011600055210006900171260000800240300001200248490000700260520134600267653002401613653002401637653002901661653002201690100001701712700002101729700002001750700001601770700001901786856013001805       2024                        eng d  a0971-457X00aSynthetic layered double hydroxide on biodegradable support: an efficient adsorbent for defluoridation of water0 aSynthetic layered double hydroxide on biodegradable support an e  cJAN  a152-1610 v313 a<p>
	Fluoride concentrations in drinking water above permissible levels and incidences of fluorosis among people have been reported from many parts of the world including India. Low-cost and biodegradable adsorbents are the preferred choice for the removal of fluoride from an aqueous medium. In the present study, zinc-aluminium layered double hydroxide (LDH) supported on sugarcane bagasse (raw and acid-treated) has been synthesized, characterized, and investigated for the defluoridation of water. The SEM micrographs of the supported adsorbents show good dispersion of the LDH particles on the support material. The defluoridation capacity of the LDH is enhanced by supporting it on bagasse. The adsorption capacity of supported adsorbents increased by 3-fold than the unsupported LDH adsorbent. The adsorption data have been well fitted to the Freundlich isotherm model indicating physical and multi-layer adsorption. The maximum fluoride adsorption capacity has been found to be 8.85 mg/g with 76.3% fluoride removal when the initial fluoride concentration is 11-12 mg/L. The pseudo-second-order kinetic model has been found suitable to explain the fluoride adsorption kinetics on the supported LDH adsorbents. The present study reveals that the bagasse-supported LDH adsorbent has a high potential for defluoridation of water.</p>
10aadsorption kinetics10aFluoride adsorption10aLayered double hydroxide10aSugarcane bagasse1 aMayadevi, S.1 aKirandas, M., D.1 aManilal, A., M.1 aRoshini, N.1 aMandal, Sujata  uhttp://library.ncl.res.in/content/synthetic-layered-double-hydroxide-biodegradable-support-efficient-adsorbent-defluoridation