Solvent extraction of Zn(II) by Cyanex 923 and its application ot a solid-supported liquid membrane system

摘要

The extraction of zinc(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 ZnCl_2·L_2, HZnCl_3·2L and H_2ZnCl_4·2L (L = ligand) in the organic phase with formation constant K_ext= 4.1, 5.6 * 10~9 and 6.7 * 10~9, respectively. The results obtained for zinc(II) distribution have been implemented in a solid-supported liquid membrane system. The influence of source phase stirring speed, membrane composition and metal concentration on zinc transport have been investigated.