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Biosorption of hexavalent chromium from aqueous solutions by Catla catla scales / Kondapalli Srividya in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 666-673 Titre : Biosorption of hexavalent chromium from aqueous solutions by Catla catla scales : equilibrium and kinetics studies Type de document : texte imprimé Auteurs : Kondapalli Srividya, Auteur ; Kaustubha Mohanty, Auteur Année de publication : 2010 Article en page(s) : pp. 666-673 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Biosorption  Chromium  Heavy  metal  Kinetics  Wastewater  treatment Index. décimale : 660 Résumé : In this work the potential of Catla catla scales to remove Cr(VI) ions from aqueous solutions was investigated as a function of time, initial Cr(VI) concentration, initial pH, biomass dose and agitation speed. Optimum biosorption conditions were found to be pH 1.0, 0.05 g L−1 biomass dosage, 200 rpm agitation speed and 180 min equilibrium time. The fitness of biosorption equilibrium data for Freundlich, Langmuir and Dubinin–Radushkevich isotherm models were tested. It was found that Freundlich model was better suitable for biosorption of Cr(VI) ions onto C. catla biomass. Three kinetic models viz. the Lagergren first-order and pseudo-second-order and intra-particle diffusion model were used to analyze the biosorption data and the results suggested that the pseudo-second-order model represented the best correlation. FTIR spectrum analysis revealed that O–H, N–H and C–O groups were the leading Cr(VI) binding groups. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X49YKT-6&_user=6 [...] [article] Biosorption of hexavalent chromium from aqueous solutions by Catla catla scales : equilibrium and kinetics studies [texte imprimé] / Kondapalli Srividya, Auteur ; Kaustubha Mohanty, Auteur . - 2010 . - pp. 666-673. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 666-673 Mots-clés : Biosorption  Chromium  Heavy  metal  Kinetics  Wastewater  treatment Index. décimale : 660 Résumé : In this work the potential of Catla catla scales to remove Cr(VI) ions from aqueous solutions was investigated as a function of time, initial Cr(VI) concentration, initial pH, biomass dose and agitation speed. Optimum biosorption conditions were found to be pH 1.0, 0.05 g L−1 biomass dosage, 200 rpm agitation speed and 180 min equilibrium time. The fitness of biosorption equilibrium data for Freundlich, Langmuir and Dubinin–Radushkevich isotherm models were tested. It was found that Freundlich model was better suitable for biosorption of Cr(VI) ions onto C. catla biomass. Three kinetic models viz. the Lagergren first-order and pseudo-second-order and intra-particle diffusion model were used to analyze the biosorption data and the results suggested that the pseudo-second-order model represented the best correlation. FTIR spectrum analysis revealed that O–H, N–H and C–O groups were the leading Cr(VI) binding groups. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X49YKT-6&_user=6 [...]