Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 78, Issue 3, Pages 298-302Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2011.01.042
Keywords
Uranium; Solvent extraction; Diglycolamide; Imidazolium-based ionic liquids
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Funding
- Ph.D. Programs Foundation of Ministry of Education of China [20090204120033]
- National Natural Science Foundation of China [J1030932]
- Fundamental Research Funds for the Central Universities [860223]
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Extraction of the uranyl ion, UO22+, in an aqueous solution was carried out using N,N,N',N'-tetrabutyl-3-oxapentanediamide (TBDA) and N,N,N',N'-dimethylDibutyl-3-oxapentanediamide (MBDA) as extractants in an ionic liquid (IL) of 1-alkyl-3-methylimidazolium hexafluorophosphate ([C-n mim][PF6], n = 4, 6, and 8). The extraction efficiency for UO22+ ion in imidazolium-type ILs was found to be higher than that in chloroform under the same conditions. The extraction mechanism was deduced by the slope analysis and extraction tests. The UO22+ extraction most likely occurs by a mechanism involving a cation-exchange. The conventional log-log plot analysis of the extraction equilibrium data reveals that UO22+ ion is extracted as cation complexes in a 1:2 ratio of UO22+ to extractant. These complexes were characterized by their IR spectral data. (C) 2011 Elsevier B.V. All rights reserved.
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