Synthesis of a Dithiocarbamate Chelate Resin and Its Oxidized form and Their Adsorption Properties for Heavy Metal Ions

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Abstract
A series of macroporous dithiocarbamate chelate resins, III and V, and an oxidized resin, VI, with high adsorption capacity were prepared. The influence of various reaction conditions of amination, dithiocarboxylation, and oxidation were examined. The structure and the conversion of functional groups of resins were confirmed by IR spectra and elemental analysis. The adsorption capacities of Resin II for Hg2+, Cu2+, Zn2+, and Cd2+ are 4.40, 2.44, 1.77, and 1.36 mmol/g, respectively. The adsorption capacities of Resins V and VI for Cu2+. Zn2+, Ni2+, Co3+, Ag+, Hg2+, Cd2+, Pb2+, and Au3+ are 4.07–0.51 and 3.81–0.59 meq ion/g, respectively. The adsorption rate and the influence of pH on the adsorption percentage of the resins for metal ions were examined. Noble metal, transitional metal, and heavy metal ions can be quantitatively adsorbed by the resins. The adsorbed Cu2+, Pb2+, Cd2+, Co3+, and Ni2+ can be quantitatively eluted with 5N HNO3, and the presence of large amounts of Ca2+, Mg2+, Fe3+, and Al3+ did not interfere.