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Immobilization of vegetable tannins on tannery chrome shavings and their use for the removal of hexavalent chromium from contaminated water / L. Chabaane in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.310-317 Titre : Immobilization of vegetable tannins on tannery chrome shavings and their use for the removal of hexavalent chromium from contaminated water Type de document : texte imprimé Auteurs : L. Chabaane, Auteur ; S. Tahiri, Auteur Année de publication : 2012 Article en page(s) : pp.310-317 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Immobilization  Tannins  Chrome  shavings  Hexavalent  chromium  Adsorption Résumé : Chestnut (C) and mimosa (M) tannins immobilized on chrome shavings (CS) as an adsorbent have been proposed to be an efficient and economical alternative in hexavalent chromium removal from aqueous solutions. The adsorption of hexavalent chromium onto chrome shavings-tannin (CS-T) adsorbents was performed using batch equilibrium technique at 25+/-2^oC. The effect of pH is highly important especially in the case of high concentrations of hexavalent chromium. The maximum chromium uptake was obtained at pH 4. Two hours of contact time are enough to reach equilibrium. Sorption of chromium on CS-T was found to follow a pseudo-second order kinetic model (with correlation coefficients greater than 0.999). The adsorption equilibrium data fitted the Langmuir model well. The maximum adsorption capacity, of dry immobilized tannin adsorbent with 11.6% polyphenol, reached 42mgCr/g and 38mgCr/g in the case of chestnut and mimosa tannins, respectively. ISSN : 1385-8947 En ligne : http://pubget.com/paper/pgtmp_469cdf51c486c0777e69c04e04029e9e [article] Immobilization of vegetable tannins on tannery chrome shavings and their use for the removal of hexavalent chromium from contaminated water [texte imprimé] / L. Chabaane, Auteur ; S. Tahiri, Auteur . - 2012 . - pp.310-317. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.310-317 Mots-clés : Immobilization  Tannins  Chrome  shavings  Hexavalent  chromium  Adsorption Résumé : Chestnut (C) and mimosa (M) tannins immobilized on chrome shavings (CS) as an adsorbent have been proposed to be an efficient and economical alternative in hexavalent chromium removal from aqueous solutions. The adsorption of hexavalent chromium onto chrome shavings-tannin (CS-T) adsorbents was performed using batch equilibrium technique at 25+/-2^oC. The effect of pH is highly important especially in the case of high concentrations of hexavalent chromium. The maximum chromium uptake was obtained at pH 4. Two hours of contact time are enough to reach equilibrium. Sorption of chromium on CS-T was found to follow a pseudo-second order kinetic model (with correlation coefficients greater than 0.999). The adsorption equilibrium data fitted the Langmuir model well. The maximum adsorption capacity, of dry immobilized tannin adsorbent with 11.6% polyphenol, reached 42mgCr/g and 38mgCr/g in the case of chestnut and mimosa tannins, respectively. ISSN : 1385-8947 En ligne : http://pubget.com/paper/pgtmp_469cdf51c486c0777e69c04e04029e9e