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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

I. Billard 1 A. Ouadi 1 E. Jobin 1 Julie Champion 1 C. Gaillard 2 S. Georg 1
1 DRS-IPHC - Département Recherches Subatomiques
2 IPNL - Institut de Physique Nucléaire de Lyon
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 : Monday, November 23, 2020 - 6:30:04 PM

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IN2P3 | DRS-IPHC | CNRS | IPHC | UNIV-LYON1 | SITE-ALSACE | IP2I | UDL

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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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