Abstract
Selective transport of Cd(II) and Zn(II) ions from sodium chloride medium through a bulk liquid membrane by using trioctyl methyl ammonium chloride (Aliquat 336) dissolved in benzene was studied at room temperature. The influence of experimental parameters affecting the transport efficiency, including chloride concentration in the sample solution, reagent concentration and type of organic solvent used in the membrane phase, type and concentration of stripping solution in the receiving phase were investigated. The transport yield of Cd(II) and Zn(II) ions from a 0.05M NaCl solution (pH3, HCl 1×10−3M) through a benzene solution of Aliquat 336 (0.03M) into the receiving phase (EDTA 0.3M or NH3 4M) was found to be 93.0 (± 0.5)% and 80.0 (± 0.7)%, respectively after 5h. The accessibility of the method was tested for recovery of Cd and Zn from zinc plant purification cake, obtained from Zanjan-Iran, and spent Ni–Cd cells.
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