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Citation
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HERO ID
3443258
Reference Type
Journal Article
Title
Synergistic extraction of uranium(VI) with TODGA and hydrophobic ionic liquid mixtures into molecular diluent
Author(s)
Turanov, AN; Karandashev, VK; Boltoeva, M; Gaillard, C; Mazan, V
Year
2016
Is Peer Reviewed?
1
Journal
Separation and Purification Technology
ISSN:
1383-5866
Volume
164
Page Numbers
97-106
DOI
10.1016/j.seppur.2016.03.004
Web of Science Id
WOS:000374614600013
URL
http://www.sciencedirect.com/science/article/pii/S1383586616301095
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Abstract
The extraction of uranium(VI) from aqueous nitric acid solutions with a neutral extractant, N,N,N',N'-tetra (n-octyl)diglycolamide (TODGA), and with the mixtures of TODGA and a hydrophobic ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C(4)mim][Tf2N]), into a molecular diluent, 1,2-dichloroethane, has been systematically investigated. The extraction efficiency of U(VI) ions was greatly enhanced by addition of a small amount of ionic liquid to an organic phase containing TODGA. The synergistic effect comes from the higher hydrophobicity of U(VI) extracted species formed by TODGA and weakly coordinating Tf2N- anions as compared to those formed by TODGA and NO3- anions as counterions in the conventional extraction system. Based on our experimental results, we concluded that the partition of Tf2N- anions between the two liquid phases is the dominant factor governing the extractability of uranium(VI) with the mixture of TODGA and ionic liquid as extractant. We showed that the extraction of U(VI) from aqueous nitric acid solutions both by TODGA alone and its mixtures with [C(4)mim][Tf2N] into 1,2-dichloroethane can be quantitatively described on the basis of the solvation extraction mechanism. However, in the extraction system with added hydrophobic ionic liquid, the partition of Tf2N- anions between the two immiscible phases and the interaction between bis(trifluorome thylsulfonyl)imide acid, HTf2N, and TODGA molecules in the organic phase should be taken into account. (C) 2016 Elsevier B.V. All rights reserved.
Keywords
Uranium(VI); Ionic liquid; TODGA; Solvent extraction; Synergistic effect
Tags
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Uranium
Uranium Literature Search Update 3/2017
WOS
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Uranium Toxicological Review
Date limited literature search 2011-2021
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WOS
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PFAS Universe
Data Source
Web of Science
1,1,1-Trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide
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