Synthesis And Characterization A New Ligand Derived From The Dithiocarbamate Compounds For Removing Divalent Hg, Pb, Co, Ni And Zn Ions From Their Aqueous Solutions

Abstract

This study included the preparation of new dithiocarbamate ligand, namely: potassium ((1,4-phenylenebis(azanediyl)) bis(2-oxoethane-2,1-diyl)) bis (benzylcarbamodithioate), (C26H24K2N4O2S4). The prepared ligand and its complexes of Co(II), Ni(II), Zn(II), Hg(II) and Pb(II) ions were characterized by FTIR, UV-Vis, 1H and 13C-NMR, Mass spectroscopy, magnetic sensitivity measurements, in addition to measurements of molar electrical conductivity and melting point. The measurements indicated that the DTC ligand has successfully coordinated to ions in a bidentate mode and the geometry of all complexes were octahedral around the dithiocarbamate groups. The prepared ligand was used for removing the aforementioned ions from their aqueous solutions, and studying the effect of pH and temperature on the removal efficiency. It was found that the effect of pH on the removal rates was much greater than the effect of temperature, and that the best rates of removal efficiency when using 0.035 g of ligand per 30 ml of solution at a concentration of 100 mg/L were: 99.18% for Hg2+ ions at (pH = 8 and 35 °C), 100% for Pb2+ ions at (pH=6 and 25 °C), and (pH=7 and 35 °C), 98.82% for Co2+ ions at (pH = 8 and 25 °C), 99.93% for Ni2+ ions at (pH = 8 and 25 °C), and 85.42% for (Zn2+) ions at (pH = 8 and 25 °C).