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Sorption studies of 134Cs, 60Co and 152+154Eu on phosphoric acid activated silico-antimonate crystals in high acidic media / Ismail M. Ali in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 580-585 Titre : Sorption studies of 134Cs, 60Co and 152+154Eu on phosphoric acid activated silico-antimonate crystals in high acidic media Type de document : texte imprimé Auteurs : Ismail M. Ali, Auteur Année de publication : 2010 Article en page(s) : pp. 580-585 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Silico-antimonate  Phosphoric  acid  activation  Sorption  kinetics Index. décimale : 660 Résumé : This work describes the sorption of 134Cs, 60Co and 152+154Eu by crystals of unmodified and phosphoric acid modified silico-antimonates (SiSb). Equilibrium and selectivity sequence for co-exiting metal ions under strongly acidic conditions of HClO4, H2SO4, HNO3 and HCl were investigated. The results showed that the silico-antimonate either in the high Sb5+ content or in the phosphated form possesses acidic characters and shows cation-exchange properties more efficient in acidic media. Kinetic studies indicated that pseudo-second-order model gave better fitting parameters comparing to that of pseudo-first-order one. The thermodynamic parameters of the sorption processes revealed spontaneous and endothermic nature. High negativity of ΔG° values for the modified SiSb confirms the positive role of phosphoric acid impregnation in the sorption process. The break-through capacities of the studied ions were further calculated from a column investigation. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4WXHC0N-4&_user=6 [...] [article] Sorption studies of 134Cs, 60Co and 152+154Eu on phosphoric acid activated silico-antimonate crystals in high acidic media [texte imprimé] / Ismail M. Ali, Auteur . - 2010 . - pp. 580-585. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 580-585 Mots-clés : Silico-antimonate  Phosphoric  acid  activation  Sorption  kinetics Index. décimale : 660 Résumé : This work describes the sorption of 134Cs, 60Co and 152+154Eu by crystals of unmodified and phosphoric acid modified silico-antimonates (SiSb). Equilibrium and selectivity sequence for co-exiting metal ions under strongly acidic conditions of HClO4, H2SO4, HNO3 and HCl were investigated. The results showed that the silico-antimonate either in the high Sb5+ content or in the phosphated form possesses acidic characters and shows cation-exchange properties more efficient in acidic media. Kinetic studies indicated that pseudo-second-order model gave better fitting parameters comparing to that of pseudo-first-order one. The thermodynamic parameters of the sorption processes revealed spontaneous and endothermic nature. High negativity of ΔG° values for the modified SiSb confirms the positive role of phosphoric acid impregnation in the sorption process. The break-through capacities of the studied ions were further calculated from a column investigation. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4WXHC0N-4&_user=6 [...]