| Titre : | Sorption studies of 134Cs, 60Co and 152+154Eu on phosphoric acid activated silico-antimonate crystals in high acidic media (2010) |
| Auteurs : | Ismail M. Ali, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Chemical engineering journal (Vol. 155 N° 3, Decembre 2009) |
| Article en page(s) : | pp. 580-585 |
| Note générale : | Génie Chimique |
| Langues : | Anglais |
| Index. décimale : | 660 |
| Tags : | Silico-antimonate Phosphoric acid activation Sorption kinetics |
| 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.
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| DEWEY : | 660 |
| ISSN : | 1385-8947 |
| En ligne : | http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4WXHC0N-4&_user=6909337&_coverDate=12%2F15%2F2009&_rdoc=4&_fmt=high&_orig=browse&_srch=doc-info%28%23toc%235228%232009%23998449996%231562277%23FLA%23display%23Volume%29&_cdi=5228&_sort=d&_doca |
