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Adsorption of aqueous selenite [Se(IV)] species on synthetic layered double hydroxide materials / Sujata Mandal in Industrial & engineering chemistry research, Vol. 48 N° 17 (Septembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7893–7898 Titre : Adsorption of aqueous selenite [Se(IV)] species on synthetic layered double hydroxide materials Type de document : texte imprimé Auteurs : Sujata Mandal, Auteur ; S. Mayadevi, Auteur ; Bhaskar D. Kulkarni, Auteur Année de publication : 2009 Article en page(s) : pp. 7893–7898 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Layered  double  hydroxide  materials  Selenite  adsorption  Kinetic  model Résumé : Layered double hydroxide materials (Zn/Al, Mg/Al, Zn/Fe) with varying composition (M2+:M3+ molar ratio, x = 3, 2, 1, and 0.33) were synthesized and evaluated for their selenium adsorption characteristics in aqueous medium. Zn/Al and Mg/Al LDHs with x = 3 and 2, exhibited very high selenite adsorption capacity. XRD patterns of the pristine LDHs, LDH after selenite adsorption, and chloride ion leaching studies revealed that adsorption of selenium on the LDHs occurred through both surface adsorption and ion-exchange mechanism. The adsorption data was fitted to Langmuir and Freundlich isotherm models. A pseudo second-order kinetic model was used to describe the adsorption kinetics of selenite on LDH materials. Desorption of selenite ions in water from the LDH−Se matrix was studied up to 5 h. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900136s [article] Adsorption of aqueous selenite [Se(IV)] species on synthetic layered double hydroxide materials [texte imprimé] / Sujata Mandal, Auteur ; S. Mayadevi, Auteur ; Bhaskar D. Kulkarni, Auteur . - 2009 . - pp. 7893–7898. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 17 (Septembre 2009) . - pp. 7893–7898 Mots-clés : Layered  double  hydroxide  materials  Selenite  adsorption  Kinetic  model Résumé : Layered double hydroxide materials (Zn/Al, Mg/Al, Zn/Fe) with varying composition (M2+:M3+ molar ratio, x = 3, 2, 1, and 0.33) were synthesized and evaluated for their selenium adsorption characteristics in aqueous medium. Zn/Al and Mg/Al LDHs with x = 3 and 2, exhibited very high selenite adsorption capacity. XRD patterns of the pristine LDHs, LDH after selenite adsorption, and chloride ion leaching studies revealed that adsorption of selenium on the LDHs occurred through both surface adsorption and ion-exchange mechanism. The adsorption data was fitted to Langmuir and Freundlich isotherm models. A pseudo second-order kinetic model was used to describe the adsorption kinetics of selenite on LDH materials. Desorption of selenite ions in water from the LDH−Se matrix was studied up to 5 h. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900136s