Abstract
A novel separation method, i.e. electro-assisted solvent extraction, based on the principles of two-phase electrochemistry, has been demonstrated for the successful separation of Ni 2+, Cu 2+ and Cd 2+ ions. 2-Heptanone has been used as the organic solvent for the transfer of Ni 2+, Cu 2+ and Cd 2+ facilitated by 2,2′;6′,2″-terpyridine. It is shown that extraction efficiency depends on the concentration ratio of ligand to metal ion and importantly, on the applied interfacial potential difference. It was found that Ni 2+ (not Cd 2+ or Cu 2+) extraction is suppressed in the presence of Mg 2+ ion due to competitive complexation.
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