| Autor: |
Wai, Chien M., Liao, Yu-Jung, Liao, Weisheng, Tian, Guoxin, Addleman, Raymond S., Quach, Donna, Pasilis, Sofie P. |
| Předmět: |
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| Zdroj: |
Dalton Transactions: An International Journal of Inorganic Chemistry; Apr2011, Vol. 40 Issue 18, p5039-5045, 7p |
| Abstrakt: |
Uranium dioxide can be dissolved directly in an imidazolium-based ionic liquid (IL) at room temperature with a tri-n-butylphosphate(TBP)–HNO3complex. The dissolution process follows pseudo first-order kinetics initially. Raman spectroscopic studies show the dissolved uranyl ions are coordinated with TBP in the IL phase with a molar ratio of (UO2)2+ : TBP = 1 : 2. The dissolved uranyl species can be effectively transferred to a supercritical fluid carbon dioxide (sc-CO2) phase. No aqueous phase is formed in either the IL dissolution or the supercritical fluid extraction process. Absorption spectra of the extracted uranyl species in the sc-CO2phase suggests the presence of a UO2(TBP)2(NO3)2and HNO3adduct probably of the form UO2(TBP)2(NO3)2·HNO3. The adduct dissociates in a water–dodecane trap solution during pressure reduction resulting in UO2(TBP)2(NO3)2collected in the dodecane phase. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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