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Issue 16, 2017
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Selective alkaline stripping of metal ions after solvent extraction by base-stable 1,2,3-triazolium ionic liquids

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Abstract

Novel 1,2,3-triazolium ionic liquids with a high base stability were synthesized for use in solvent extraction of first-row transition elements and rare earths from chloride media. The synthesis of these ionic liquids makes use of a recently reported, metal-free multicomponent reaction that allows full substitution of the 1,2,3-triazolium skeleton. The physical and chemical properties of these ionic liquids are compared with those of a trisubstituted analog. Peralkylation of the 1,2,3-triazolium skeleton leads to ionic liquids with superior properties, such as low viscosity, low solubility in water and higher thermal and base stability. Iodide and thiocyanate ionic liquids with peralkylated cations were applied to the solvent extraction of metal ions, and their stability in alkaline media was exploited in the selective stripping of the metals from the loaded ionic liquid phase by alkaline solutions. EXAFS and Raman spectroscopy were performed to gain insight into the extraction mechanism. The applicability of these extraction systems was demonstrated in separations relevant for the recovery of metals from ores and end-of-life products: Fe(III)/Cu(II)/Zn(II) (copper ores, brass scraps) and Fe(III)/Nd(III) (rare earth magnets).

Graphical abstract: Selective alkaline stripping of metal ions after solvent extraction by base-stable 1,2,3-triazolium ionic liquids

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Publication details

The article was received on 19 Feb 2017, accepted on 21 Mar 2017 and first published on 22 Mar 2017


Article type: Paper
DOI: 10.1039/C7DT00624A
Citation: Dalton Trans., 2017,46, 5269-5278
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    Selective alkaline stripping of metal ions after solvent extraction by base-stable 1,2,3-triazolium ionic liquids

    S. Raiguel, D. Depuydt, T. Vander Hoogerstraete, J. Thomas, W. Dehaen and K. Binnemans, Dalton Trans., 2017, 46, 5269
    DOI: 10.1039/C7DT00624A

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