Quantitative extraction of Rh( iii ) using ionic liquids and its simple separation from Pd( ii )
Résumé
The extraction of Pd(II) and Rh(III) from acidic solutions containing between 1 and 8 M HCl towards three ionic liquids, namely [P 66614 ][Cl], [P 66614 ][Br] and [P 66614 ][DCA], based on the trihexyltetradecylphosphonium cation ([P 66614 ]) 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 [P 66614 ][Br] is also reported. [P 66614 ][Cl] and [P 66614 ][Br] were found to be very efficient at separating these two metals from aqueous solutions containing at least 6 mol L −1 HCl.
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