Issue 77, 2015

Selone behavior towards palladium(ii) extraction with hydrophobic ionic liquids and mechanism studies

Abstract

A selenium-bearing extractant was evaluated for palladium extraction for the first time. The 1-butyl-3-methyl-imidazole-2-selone was synthesized, and dissolved in hydrophobic ionic liquids to extract palladium from aqueous solutions. Based on the studies of the influencing factors, the first elaboration of the selone extraction mechanism is offered. One of the Pd–selone complexes was analyzed with single crystal X-ray diffraction to explain the elevation of extractability relative to thiones from the molecular level. A novel combination of UV-vis spectroscopy, HPLC and 77Se{1H} NMR was first used to characterize the extraction system and to determine the complexing number. It was confirmed that various kinds of complexes had been extracted to the organic phase at different selone concentrations, thus the apparent complexing number was proposed to describe the extraction system. Both the extractability and the selectivity of the selone for Pd(II) extraction over other metal ions were evaluated to be high.

Graphical abstract: Selone behavior towards palladium(ii) extraction with hydrophobic ionic liquids and mechanism studies

Supplementary files

Article information

Article type
Paper
Submitted
09 Apr 2015
Accepted
02 Jul 2015
First published
02 Jul 2015

RSC Adv., 2015,5, 63087-63094

Author version available

Selone behavior towards palladium(II) extraction with hydrophobic ionic liquids and mechanism studies

C. Wang, Y. Tong, Y. Huang, H. Zhang and Y. Yang, RSC Adv., 2015, 5, 63087 DOI: 10.1039/C5RA06334E

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