Two different ionic liquids, 1-alkyl-3-methylimidazolium hexafluorophosphate and 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, were used as a transport carrier of rhodium (III) extraction. Extraction of rhodium from hydrochloric acid media was conducted by liquid surfactant membranes (LSMs) containing the ionic liquid carrier. The extraction of rhodium was accelerated by the addition of tin (II) to the aqueous feed solution. The effects of various operational parameters on the extraction behavior of rhodium and tin were investigated. The extraction rates of both metals were greatly influenced by the ionic liquid species, the surfactant concentration, and the concentration of stripping reagent. The alkyl-chain length and the anionic part in the ionic liquids were proved to be important to get a high extraction yield of rhodium. In addition, it was found that the concentration of 2-amino-2-hydroxymeth-yl-1,3-propanediol used as the stripping reagent played a crucial role on the selective extraction of rhodium from a large amount of tin, and there was an optimum concentration to obtain the best performance of LSMs. Under the optimum operating conditions for the present system, rapid and quantitative extraction of rhodium was achieved.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)