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Comparison of uranyl extraction mechanisms in an ionic liquid by use of malonamide or malonamide-functionalized ionic liquid

Abstract : The extraction of uranyl from acidic (HNO3) aqueous solutions toward an ionic liquid phase, C1-C4-imTf2N (1-methyl,3-butylimidazolium Tf2N), has been investigated as a function of initial acid concentration and ligand concentration for two different extracting moieties: a classical malonamide, N,N′-dimethyl-N,N′-dibutylmalonamide (DMDBMA) and a functionalized IL composed of the Tf2N− anion and an imidazolium cation on which a malonamide pattern has been grafted (FIL-MA). The extraction mechanism, as demonstrated through the influence of added C1-C4-imCl or added LiTf2N in the aqueous phase, is slightly different between the DMDBMA and FIL-MA extracting agents. Modeling of the extraction data evidences a double extraction mechanism, with cation exchange of UO22+versus 2 H+ for DMDBMA or versus C1-C4 -im+ and H+ for FIL-MA at low acidic values, and through anion exchange of [UO2(NO3)3]−versus Tf2N− for both ligands at high HNO3 concentrations. The FIL-MA molecule is more efficient than its classical DMDBMA parent.
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http://hal.in2p3.fr/in2p3-00711076
Contributor : Dominique Girod <>
Submitted on : Friday, June 22, 2012 - 12:23:17 PM
Last modification on : Monday, November 23, 2020 - 6:30:04 PM

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M. Bonnaffé-Moity, A. Ouadi, V. Mazan, S. Miroshnichenko, D. Ternova, et al.. Comparison of uranyl extraction mechanisms in an ionic liquid by use of malonamide or malonamide-functionalized ionic liquid. Dalton Transactions, Royal Society of Chemistry, 2012, 41, pp.7526-7536. ⟨10.1039/C2DT12421A⟩. ⟨in2p3-00711076⟩

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