Analytical Sciences

Selective Transport of Silver Ion through a Supported Liquid Membrane Using Hexathia-18-Crown-6 as Carrier

Mojtaba SHAMSIPUR,*  Gholamhasan AZIMI,* Mohammad Hossein MASHHADIZADEH,* and Sayed Siavash MADAENI**

*Department of Chemistry, Razi University, Kermanshah, Iran
**Department of Chemical Engineering, Razi University, Kermanshah, Iran

A facile supported liquid membrane (SLM) system for the selective and efficient transport of silver ion is introduced. The SLM used is a thin porous polyvinyldifluoride membrane impregnated with hexathia-18-crown-6 (HT18C6) dissolved in nitrophenyloctyl ether. HT18C6 acts as a specific carrier for the uphill transport of Ag ⁺ ion as its picrate ion paired complex through the SLM. In the presence of thiosulfate ion as a suitable stripping agent in the strip solution, transport of silver occurs almost quantitatively after 4 h. The selectivity and efficiency of silver transport from aqueous solutions containing other Mⁿ⁺ cations such as Mg²⁺, Ca²⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺, Pb²⁺, Cd²⁺, Hg²⁺, Fe³⁺ and Cr³⁺ ions were investigated.

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