Abstract
The e ect of 1-butyl-3-methylimidazolium bis[(tri uoromethyl)sulfonyl]imide ionic liquid on the extraction of lanthanides(III), U(VI), and Th(IV) from nitric acid solutions with 1,2-bis(diphenylphosphinyl)ethane I and 1,2-bis(diphenylphosphinyl)benzene II has been studied. The stoichiometry of the extractable complexes was determined. A solution of dioxide II in dichloroethane extracts metal ions much more e ciently than a solution of dioxide I. It has been established that, in the presence of an ionic liquid in the organic phase, the e ciency of extraction of metal ions from nitric acid solutions with solutions of dioxide I increases signi cantly, while that of dioxide II decreases. As a result, in the presence of an ionic liquid in the organic phase, dioxide II is signi cantly inferior to dioxide I in terms of the e ciency of extraction of Ln(III), U(VI), and Th(IV) from nitric acid solutions, which is associated with a much higher ability of dioxide II to extract HTf2N.
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