Abstract
Abstract Previous research showed that N,N′-dimethyl-N,N′-dicyclohexylthiodiglycolamide (DMDCHTDGA) in 1,2-dichloroethane is able to co-extract platinum(IV) and palladium(II) from concentrated hydrochloric acid solutions. Following a detailed study about Pt(IV), the present work focuses on the thorough investigation of Pd(II) extraction by DMDCHTDGA in toluene. The removal of Pd(II) is rather efficient from 0.5 M to 5.5 M HCl, and progressively decreases until 7.5 M HCl. Pd(II) stripping is better achieved by an acidic thiourea solution, but ammonia aqueous phases can alternatively be used for some cases. Pd(II) extraction kinetics is relatively favored (5–15 min). The robustness of DMDCHTDGA to extract Pd(II) has been confirmed through five successive reutilization experiments. The maximum loading capacity for Pd(II) reaches a 2.5 DMDCHTDGA:Pd(II) molar ratio. Pd(II) can selectively be recovered by DMDCHTDGA from 4.0 M or 6.0 M HCl complex mixtures containing equivalent concentrations of Pt(IV) and Rh(III), and fivefold Fe(III) and Al(III) concentrations, although with a slight Pt(IV) contamination.
Published Version
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