Journal
HYDROMETALLURGY
Volume 113, Issue -, Pages 79-85Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2011.12.006
Keywords
Palladium(II) extraction; Stripping; Quaternary phosphonium salts; Ionic liquids; Chloride media
Categories
Funding
- [32-067/2012 DS-PB]
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Extractive recovery of palladium(II) from a hydrochloric acid solution with quaternary phosphonium salt: trihexyl(tetradecyl)phosphonium bis-(2,4,4-trimethylpentyl)phosphinate (Cyphos (R) IL 104) as a novel reagent in the presence of toluene has been investigated. Extraction data indicate that Cyphos (R) lL 104 is a very efficient and fast extractant. The increase in HCl concentration has negative influence on the extraction and 96 and 52% of palladium(II) ions can be effectively extracted with Cyphos (R) IL 104 from 0.1 and 3.0 M HCl, respectively. The equilibrium of palladium(II) extraction from aqueous 0.1 and 3.0 M HCl with this phosphonium ionic liquid is achieved after 5 min. Extraction of palladium(II) with Cyphos IL 104 proceeds at the interface according to the anion-exchange mechanism. The best stripping solution from among the studied ones is 0.5 M NH4OH. The feasibility of reuse Cyphos (R) IL 104 in several cycles of extraction-stripping process was also examined. Increase in temperature from 20 to 70 degrees C causes a negligible decrease in the palladium(II) extraction. The calculated values of Delta H degrees, Delta S degrees and Delta G degrees evidence that the extraction of palladium(II) with Cyphos (R) IL 104/toluene mixture is an exothermic reaction both from 0.1 and 3.0 M HCl solutions. (C) 2011 Elsevier B.V. All rights reserved.
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