Titanosilicates: Giant exchange capacity and selectivity for Sr and Ba
In: Separation and purification technology, Jg. 95 (2012), S. 222-226
academicJournal
- print, 32 ref
Zugriff:
Two different microporous Na-titanosilicates with high cation exchange capacities were synthesized and characterized by X-ray diffraction, scanning electron microscopy (SEM) and solid-state 29Si and 27Al magic-angle spinning nuclear magnetic resonance (MASNMR) spectroscopy. The ion exchange properties of Na-ETS-4 (ETS = Engelhard TitanoSilicate) and Na-titanosilicate were investigated for Sr2+ and Ba2+ using isotherms and Kielland plots in order to check the potential for the decontamination of 90Sr and 133Ba from nuclear waste solutions. Na-ETS-4 and Na-titanosilicate show high affinity for Sr2+ to high equivalent fraction of Sr2+ on solid phase. In case of Ba2+ the selectivity coefficient of both titanosilicate exchangers rapidly decreased due to the steric hindrance at exchange sites at XBa > ∼0.5. However, Na-ETS-4 was still selective for Ba2+ even after the above rapid decrease in selectivity, unlike Na-titanosilicate. Therefore, Na-ETS-4 is one of the best candidates for the removal of both Sr2+ and Ba2+ from nuclear waste solutions.
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Titanosilicates: Giant exchange capacity and selectivity for Sr and Ba
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Autor/in / Beteiligte Person: | YOUNG DONG, NOH ; KOMARNENI, Sridhar ; MACKENZIE, Kenneth J. D |
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Zeitschrift: | Separation and purification technology, Jg. 95 (2012), S. 222-226 |
Veröffentlichung: | Kidlington: Elsevier, 2012 |
Medientyp: | academicJournal |
Umfang: | print, 32 ref |
ISSN: | 1383-5866 (print) |
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