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The role of association of ions in ionic liquid/molecular solvent mixtures on metal extraction

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Abstract

Several mixtures of butyl acetate (BA) and an ionic liquid (1-methyl-3-octylpyrrolidinium bis(trifluoromethylsulfonyl)imide, [C1C8Pyrro][NTf2], 1-octyl-pyridinium bis(trifluoromethylsulfonyl)imide, [C8Pyr][NTf2], 1-butyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide, [C1C4Im][NTf2] or 1-octyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide, [C1C8Im][NTf2]) have been characterized by measuring density, viscosity and conductivity, from pure BA to pure ILs at 298.15 K. The ionicity of these mixtures has been determined on the basis of electrical conductivity and NMR spectroscopy. IR spectra of these mixtures were used to examine the interactions between ions. In parallel, Pt(IV) was extracted from the acidic aqueous phase towards mixtures of BA and [C1C8Im][NTf2] over the entire composition range. A drastic modification in the distribution coefficient of Pt(IV) was observed at ca xAB = 0.8. A drop was also observed in the ionicity of the extracting phase (IL + BA) at a similar composition. The variation of the distribution coefficient is ascribed to changes in the interactions in the mixtures, which in turn could induce changes in the extraction mechanism.

Graphical abstract: The role of association of ions in ionic liquid/molecular solvent mixtures on metal extraction

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Publication details

The article was received on 29 Aug 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05886A
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    The role of association of ions in ionic liquid/molecular solvent mixtures on metal extraction

    J.-M. Andanson, N. Papaiconomou, P.-A. Cable, M. Traïkia, I. Billard and P. Husson, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP05886A

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