The phenoxy-amino ligands 2-(((2-(diethylamino)ethyl)amino)methyl)phenol (L1) and 2-(((2-mercaptoethyl)amino)methyl)-phenol (L2) were studied as model chelating agents for liquid-liquid extraction of copper(II), zinc(II), cadmium(II) and lead(II) cations from water using dichloromethane-water biphasic system. The relative affinities of these chelating ligands for copper(II), zinc(II), cadmium(II) and lead(II) by liquid-liquid extraction were found to be in the order copper(II)> zinc(II) > cadmium(II) > lead(II). The ligands L1 and L2 showed binding efficiencies ranging from 78%–97% for copper(II), 75%–91% for zinc(II), 76%–92% for cadmium(II) and 59%–67% for lead(II). The extraction protocol was successfully applied to sewage effluent.
Phenoxy-amino ligands (L1) and (L2) showed good potential as chelating agents for the removal of the heavy metals Cu(II), Zn(II), Pb(II), and Cd(II) from water.
Ligands L1 and L2 demonstrated their potential application in the extraction of Cu(II) and Zn(II) from sewage effluent.
The nature of the metal ion and ligand architecture influenced the extraction ability of the ligands.