Interfacial transfer of Cd2+ assisted by 4′ - morpholino-acetophenone-4-phenyl-3-thiosemicarbazone across the water/1,2-dichloroethane interface

Abstract

The assisted transfer of heavy metal ions by interfacial complexation with 4′-morpholinoacetophenone-4-phenyl-3-thiosemicarbazone (MAPPT) at the interface between two immiscible electrolyte solutions (ITIES) was studied by cyclic voltammetry. The voltammograms obtained across the water/1,2-dichloroethane interface using the MAPPT ligand in the organic phase shows that the assisted metal ion transfers have different nature for different ions. The quasi-reversible voltammetric peak of the Cd2+ ion was obtained and is discussed in detail. The dependence of the half-wave transfer potential on MAPPT concentration showed that the equilibrium is effectively displaced towards a 1:3 (metal:ligand) stoichiometry with an association constant of log βo =15.46 (±0.11) for the Cd2+ ion, corresponding to the TIC/TID mechanism. © 2010 Versita Warsaw and Springer-Verlag Wien.