期刊
SEPARATION SCIENCE AND TECHNOLOGY
卷 49, 期 7, 页码 966-973出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2013.878721
关键词
platinum; palladium; N; N'-tetrasubstituted malonamide derivative; solvent extraction; hydrochloric acid
资金
- Portuguese national funds through FCT - Fundacao para a Ciencia e a Tecnologia (Lisbon, Portugal) [PTDC/QUI-QUI/109970/2009]
- Fundação para a Ciência e a Tecnologia [PTDC/QUI-QUI/109970/2009] Funding Source: FCT
The solvent extraction performance of N,N'-dimethyl-N,N'-dibutylmalonamide (DMDBMA) in 1,2-dichloroethane (1,2-DCE) towards platinum(IV) and palladium(II) in hydrochloric acid media was systematically evaluated. Pt(IV) extraction (%E) increases with the HCl concentration in the aqueous phases, being always higher than 72%, whereas Pd(II) extraction decreases from 65% at 1 M HCl to 22% at 8 M HCl. Several stripping agents for the two metals were tested: Pt(IV) is successfully recovered by a 1 M sodium thiosulfate solution, whereas the best result for Pd(II) was achieved with 0.1 M thiourea in 1 M HCl. The loading capacity of DMDBMA for Pt(IV) is high, and data obtained from successive extraction-stripping cycles suggest a good DMDBMA stability pattern. Attempts to replace 1,2-DCE by more environmentally-friendly diluents showed, in general, worse %E for Pt(IV). The dependence of Pt(IV) distribution coefficients on DMDBMA and chloride ion concentrations, as well as on acidity, are the basis of a proposal for the composition of Pt(IV) extracted species.
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