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Removal of hexavalent chromium from water by adsorption onto surfactant modified montmorillonite / Mariana Coutinho Brum in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 270–272 Titre : Removal of hexavalent chromium from water by adsorption onto surfactant modified montmorillonite Type de document : texte imprimé Auteurs : Mariana Coutinho Brum, Auteur ; Jefferson Leixas Capitaneo, Auteur ; José Farias Oliveira, Auteur Année de publication : 2011 Article en page(s) : pp. 270–272 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Environmental  Pollution  Surface  modification Résumé : The utilization of organoclays as adsorbents in the remediation of polluted water has been the subject of many recent research studies. In the present work, the adsorption of hexavalent chromium onto montmorillonite modified by the cationic surfactant cetylpyridinium bromide (CPB) was studied by aiming at water pollution remediation. The electrophoretic mobility measurements of the organo-montmorillonite showed a zeta potential reversion from negative to positive in the whole acidic pH range and up to pH 8.5. In some cases the adsorption of chromate ions onto the organo-montmorillonite was higher than 98% and was well described by the Langmuir adsorption isotherm. The utilization of montmorillonite modified by CPB showed to be an attractive solution to the remediation of water contaminated with chromate ions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002623 [article] Removal of hexavalent chromium from water by adsorption onto surfactant modified montmorillonite [texte imprimé] / Mariana Coutinho Brum, Auteur ; Jefferson Leixas Capitaneo, Auteur ; José Farias Oliveira, Auteur . - 2011 . - pp. 270–272. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 270–272 Mots-clés : Environmental  Pollution  Surface  modification Résumé : The utilization of organoclays as adsorbents in the remediation of polluted water has been the subject of many recent research studies. In the present work, the adsorption of hexavalent chromium onto montmorillonite modified by the cationic surfactant cetylpyridinium bromide (CPB) was studied by aiming at water pollution remediation. The electrophoretic mobility measurements of the organo-montmorillonite showed a zeta potential reversion from negative to positive in the whole acidic pH range and up to pH 8.5. In some cases the adsorption of chromate ions onto the organo-montmorillonite was higher than 98% and was well described by the Langmuir adsorption isotherm. The utilization of montmorillonite modified by CPB showed to be an attractive solution to the remediation of water contaminated with chromate ions. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002623