Quantitative extraction of Rh(iii) using ionic liquids and its simple separation from Pd(ii)

Lenka Svecova; Nicolas Papaiconomou; Isabelle Billard

doi:10.1039/c6dt02384c

Quantitative extraction of Rh(iii) using ionic liquids and its simple separation from Pd(ii)

Dalton Trans. 2016 Sep 27;45(38):15162-15169. doi: 10.1039/c6dt02384c.

Authors

Lenka Svecova¹, Nicolas Papaiconomou², Isabelle Billard¹

Affiliations

¹ Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France and CNRS, LEPMI, F-38000, Grenoble, France.
² Univ. Grenoble-Alpes, LEPMI, F-38000, Grenoble, France and CNRS, LEPMI, F-38000, Grenoble, France and Univ. Savoie, LEPMI, F-73000, Chambéry, France. nicolas.papaiconomou@lepmi.grenoble-inp.fr.

PMID: 27711786
DOI: 10.1039/c6dt02384c

Abstract

The extraction of Pd(ii) and Rh(iii) from acidic solutions containing between 1 and 8 M HCl towards three ionic liquids, namely [P₆₆₆₁₄][Cl], [P₆₆₆₁₄][Br] and [P₆₆₆₁₄][DCA], based on the trihexyltetradecylphosphonium cation ([P₆₆₆₁₄]) and chloride, bromide or dicyanamide (DCA) anions, respectively, is reported. Extraction of Pd(ii) is quantitative up to 6 M HCl (D > 3000). A value of 258 for the distribution coefficient of Rh(iii) extracted from 1 M HCl towards [P₆₆₆₁₄][Br] is also reported. [P₆₆₆₁₄][Cl] and [P₆₆₆₁₄][Br] were found to be very efficient at separating these two metals from aqueous solutions containing at least 6 mol L^-1 HCl.