Polydithiocarbamate Resin Based on Macroreticular Styrene- Divinylbenzene Copolymer for the Removal of Trace and Heavy Metal Ions

摘要

A new chelating resin was synthesized by the modification of styrene-divinylbenzene (2%) copolymer and incorporation of dithiocarbamate groups. The polydithiocarbamate resin was characterised by elemental analysis, thermal studies and IR studies. The analytical characteristics of the sorbent were established and optimum sorption conditions for Cu, Ni, Pb, Fe, As and Mn determined. The total sorption capacity of the resin was 37mg/g for Ni(Ⅱ), 35mg/g for Cu(Ⅱ), 29mg/g for Fe(Ⅲ) and 23mg/g for Pb(Ⅱ). The optimum pH for the removal of metal ions was 3-5 for Ni(Ⅱ), 5 for Cu(Ⅱ), 4 for Fe(Ⅲ) and 4-5 for Pb(Ⅱ). High sorption capacity was observed when compared to other conventional chelating polymers. The sorption kinetics was fairly rapid, as apparent from the loading half time t_(1/2) values, indicating a better accessibility of the chelating sites.