Application of Different Ligands to Optimize Cd(II) Removal Through Liquid Membranes
Among numerous techniques for successful separation and removal of metal cations, transport through bulk liquid membranes attracts special attention of researchers. In this paper, different ligands were applied as possible carriers for Cd(II) ions. Influence of substituents in macrocyclic ligands derived from 18-crown-6 reflected in decreased amount of transported Cd(II) ions, compared to 18-crown-6 (61,26%), in all used solvents, following the order: DCH18C6<DB18C6<B18C6<18C6. Addition of nonionic surfactants as possible carriers for Cd(II) ions within the liquid membranes also resulted with decreased transport rates, due to additional interactions of Cd(II) ions and carriers within the membrane.