Centre National De La Recherche Scientifique

Institut Polytechnique De Grenoble

Universidade De Aveiro

Université Savoie Mont Blanc

Isabelle Billard

João Manuel Da Costa E Araújo Pereira Coutinho

Nicolas Papaiconomou

Matthieu Gras

Disclosed is a process for extracting or separating metal ions using a composition including: an ionic liquid of formula C,&#x2212;X, in which: Cis an onium cation including at least one hydrocarbon chain Rincluding from 6 to 20 carbon atoms; X&#x2212; is an anion of charge p, the ionic liquid having a solubility in water at 20&#xb0; C. of at least 10 g/l; an acid; and water. The composition includes two liquid phases: a phase enriched in ionic liquid &#x3d5;; and a phase enriched in water &#x3d5;, the pH of which is less than or equal to 4.7. The composition is useful for extracting a metal ion from an acidic aqueous medium including a metal ion, for separating metal ions from an aqueous medium including at least two metal ions or for purifying an acidic aqueous solution including a metal ion.

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Grenoble, France

Isabelle Billard