Abstract
An innovative application of supported liquid membranes (SLMs) to the selective simultaneous separation of Ag + and Hg 2+ ions from a dilute feed by employing a two-membrane–three-compartment cell is introduced. Two micro-porous PP supported membrane loaded with a mixed N/O/S-donor macrocycle aza-thioether crown containing the 1,10-phenanthroline sub-unit (PhenS 2O) and tetrathia-12-crown-4 (TT12C4) were used for selective transport of silver and mercury ions, respectively. The PhenS 2O-loaded membrane was placed between the first and the second compartments, whereas the TT12C4-loaded membrane was placed between the second and the third compartments of the transport cell. The use of this cell assembly, under optimized experimental conditions, made it possible to transport Ag + and Hg 2+ ions simultaneously from a 1.0 × 10 −3 M picric acid feed solution containing these two species and several other interfering ions into the two corresponding strip compartments of the transport cell. Sodium thiosulfate (0.04 M) and EDTA disodium salt (0.025 M) were used as stripping agents for Ag + and Hg 2+ ions, respectively.
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