Facilitated transport of palladium(II) across polymer inclusion membrane with ammonium ionic liquid as effective carrier

Abstract

This work focuses on the application of polymer inclusion membrane (PIM) with tricaprylmethylammonium thiosalicylate, [A336][TS] (TOMATS), a thiol-containing task-specific ionic liquid for the transport of Pd(II) ions from aqueous solutions. 0.3 M thiourea in 0.1 M hydrochloric acid was found the most effective stripping phase in the transport of Pd(II) from membrane phase containing TOMATS. Separation of Pd(II) ions was also carried out from hydrochloric acid solution containing Pt(IV), Fe(III), Ni(II), and Mn(II). Pd(II) ions were preferably transported in the presence of these metal ions. The separation coefficients followed the order:[TS] proved to be an excellent ion carrier for Pd(II) from hydrochloric acid solution. The results also showed that transport efficiency of the PIM was reproducible and it can be useful for the development of the simple and highly effective method of Pd(II) recovery from leach liquor of spent catalysts.

Application of Plasticized Cellulose Triacetate Membranes for Recovery and Separation of Cerium(III) and Lanthanum(III)

“…Transport measurements were carried out in the experimental rig described and presented in detail elsewhere [3][4][5][6]. The volumes of source and receiving phases were both equal to 100 cm 3 .…”

“…The membranes were prepared as described in detail elsewhere [3][4][5][6]. Solutions of CTA, the ion carrier (Cyanex 272, Cyanex 301), and the plasticizer (NPOE) in dichloromethane were prepared.…”

“…Moreover, this component performs the function of the solvent for the carrier. The membrane containing the appropriate ion carrier is used to separate two aqueous phases: the source phase containing mixture of metal ions and the receiving phase (e.g., inorganic acid) [4][5][6][7][8]. The effi ciency and selectivity of the metal ions transferred through membrane mainly depend on the kind of carriers.…”

“…The organophosphorus acids, amine-based compounds (quaternary ammonium and phosphonium salts and tertiary amines), and neutral or solvating extractants are used as the carriers for synthesis of PIM [1,2,[9][10][11][12]. The most important advantages of PIMs' application are their low cost of process and high selectivity [1][2][3][4][5][6]. On the other hand, the drawbacks of PIMs are their relatively low diffusion coeffi cient and long-lasting transport across membrane [1].…”

“…On the other hand, the drawbacks of PIMs are their relatively low diffusion coeffi cient and long-lasting transport across membrane [1]. However, separation of metal ions through PIM can be more attractive compared to solvent extraction with higher organic substances consumption and two step operation (extraction and stripping) [6].…”