Selective Separation and Recovery of Pt(IV) from Pd(II) through an Imidazolium-ionic-liquid-based Supported Liquid Membrane

Abstract

A supported liquid membrane (SLM) system for the selective separation of platinum(IV) from palladium(II) has been developed. The SLM was prepared using imidazolium-based IL 1-octy-3-methylimidazolium bis(trifluoromethanesulfonyl)imide. The initial flux and separation factor of Pt(IV) from Pd(II) were found to significantly depend on the composition of the receiving solution. Based on the performance, a 0.1 mol dm-3 NaClO4 solution was selected as a suitable receiving solution. Membrane transport experiments showed that 93% of Pt(IV) can be selectively transported into the receiving solution, whereas most Pd(II) remains in the feed solution.

Separation and Recovery of Scandium from Sulfate Media by Solvent Extraction and Polymer Inclusion Membranes with Amic Acid Extractants

“…A transport system (PERMCELL KH-55P, Vidrex) with the PIM sandwiched between the feed and receiving compartment was used for membrane transport experiments and is shown in Figure . , The membrane surface area exposed to the solutions was 4.9 × 10 –4 m 2 . The initial feed solution was prepared in the same manner as in the solvent extraction experiments.…”

Efficient and selective adsorption of Au(iii), Pt(iv), and Pd(ii) by a radiation-crosslinked poly(ionic liquid) gel

“…13 In recent years, imidazole-based ILs have been widely used for surface modification and immobilization, and play an important role in adsorption separation and catalysis. [14][15][16][17][18][19] For example, Masilela et 6 ] and Cyphos 101 could also be used in the extraction of Ag(I). 20 Liu et al reported that 1-butyl-3-benzimidazole bromide ([HBBIm]Br) possessed a high extraction efficiency of 99.99% for Pt(IV) and Pd(II), and selectively extracted Pt(IV) and Pd(II).…”

Amide-functionalised phosphonium-based ionic liquids as ligands for rhodium(iii) extraction

“…Ionic liquids (ILs) have drawn interest as extractants or diluents in solvent extraction of metal ions; in particular, phosphonium-based ILs have been studied for application to PGM extraction. [30][31][32][33][34][35][36][37][38][39][40] Recently, Papaiconomou and co-workers report highly effective extraction of Rh(III) (>95%) with undiluted trihexyl(tetradecyl)phosphonium chloride ([P 66614 ][Cl]) as the extracting phase. 26,39 However, [P 66614 ][Cl] has a high viscosity (1931 mPa s at 298 K) 35 compared with those of commonly used extractant phases (i.e., a mixture of an extractant and a diluent), owing to the large and bulky cations that have long alkyl chains.…”