The extraction of Pd(ii) and Rh(iii) from acidic solutions containing between 1 and 8 M HCl towards three ionic liquids, namely [P][Cl], [P][Br] and [P][DCA], based on the trihexyltetradecylphosphonium cation ([P]) 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][Br] is also reported. [P][Cl] and [P][Br] were found to be very efficient at separating these two metals from aqueous solutions containing at least 6 mol L HCl.
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| http://dx.doi.org/10.1039/c6dt02384c | DOI Listing |
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