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Understanding the Extraction Mechanism in Ionic Liquids: UO(2)(2+)/HNO(3)/TBP/C(4)-mimTf(2)N as a Case Study

Abstract : The extraction of U(VI) by tributylphosphate in the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide), C4-mimTf2N, has been studied as a function of TBP and HNO3 initial concentrations. Extraction measurements have been completed by UV-vis spectroscopy in order to get insights into the extraction mechanism. The proposed chemical model describes the data through a fit of uranyl distribution ratios, while some other suggestions are unable to do so. In this model, uranyl extraction is proposed to proceed via cation exchange at low initial acidities ([UO2(TBP)n]2+ versus C4-mim+ and H+) and via anion exchange at high HNO3 concentrations ([(UO2(NO3)3(TBP)m]− versus Tf2N−). By contrast to the usual TBP/dodecane organic phase, the IL system does not favor the neutral species UO2(NO3)2(TBP)2, and TBP does not extract nitric acid.
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http://hal.in2p3.fr/in2p3-00690867
Contributor : Dominique Girod <>
Submitted on : Tuesday, April 24, 2012 - 3:41:37 PM
Last modification on : Tuesday, July 21, 2020 - 10:34:03 AM

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I. Billard, A. Ouadi, E. Jobin, Julie Champion, C. Gaillard, et al.. Understanding the Extraction Mechanism in Ionic Liquids: UO(2)(2+)/HNO(3)/TBP/C(4)-mimTf(2)N as a Case Study. Solvent Extraction and Ion Exchange, Taylor & Francis, 2011, 29, pp.577-601. ⟨10.1080/07366299.2011.566494⟩. ⟨in2p3-00690867⟩

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