Synthesis, Characterization and Metal Ion Chelating Efficiency of an Environment-Friendly Copolymers Containing Dithio Formic Acid and Thiosemicarbazide or 1,2,4-Triazole Group

Abstract

Six phenolic monomers (M 1 - M 6 ) have been synthesized, namely, potassium-3-(ortho,para)-hydroxy benzoyl dithiofor- mate (M 1 and M 2 ), (ortho,para)-(4-amino-5-mercapto-1,2,4 triazol-3-yl)-phenol (M 3 and M 4 ), (ortho,para)-hydroxy benzoic acid thiosemicarbazide (M 5 and M 6 ) and twelve novel chelating terpolymers (P 1 - P 12 ) were synthesized by ter- polymerization condensation reaction of these monomers with phenol or bis phenol-A and excess of formalin in basic medium. The monomers (M 1 - M 6 ) and their co-polymers (P 1 - P 12 ) were characterized by FT.IR, H 1 -NMR, elemental analysis and thermal analysis (TGA) and according to data obtained the structures of these compounds were proposed. Analytical evaluation of chelating selectivity of these polymers toward (Co 2+ , Cr 3+ , Cu 2+ , Cd 2+ , Pb 2+ ) were achieved by batch equilibrium method, the results show that all synthetic resins have high efficiency toward (Cr 3+ ) and less effi- ciency toward (Co 2+ , Cu 2+ , Cd 2+ and Pb 2+ ).