Liquid-liquid extraction of Cd(II) by Cyanex 923 and its application to a solid-supported liquid membrane system

摘要

The extraction of cadmium (II) by Cyanex 923 (phosphine oxides mixture) in Solvesso 100 from hydrochloric acid solution has been investigated. The extraction reaction is exothermic. The numerical analysis of metal distribution data suggests the formation of CdCl2•2L, HCdCl3•2L and H2CdCl4•2L (L=ligand) in the organic phase. The results obtained for cadmium (II) distribution have been implemented in a solid-supported liquid membrane system. The influence of feed phase stirring speed (400-1400 min-1), membrane composition (carrier concentration: 0.06-1 mol dm-3) and metal concentration (0.01-0.08 g dm-3) on cadmium transport have been investigated.