The New Chelating Sorbent with Diethyldithiocarbamate Functional Groups Immobilised on Resorcinol-Formaldehyde Copolymer

摘要

A series of chelating sorbents has been synthesized by the modification of resorcinol-formaldehde copolymer with different amounts of Na-diethyldithiocarbamate.The obtained resorcinol-formaldehyde-diethyldithiocarbamate (RSD) sorbents have been characterized by elemental analysis,metal ion capacity and infrared spectroscopy.RFD~3 sorbents has been chosen for the detailed sorption studies owing to its highest metal-ion capacity.Distribution coefficients (K_d) of 17 metal ions have been determined in demineralised water,0.1 mol L~(-1) HNO_3 and buffer solutions (pH 2,4 and 6).Since various metal-ions differed with respect to K_d values,one achieved their speciation on small columns packed with RFD~3 sorbent.Its satisfactory selectivity towards Ag~+,Zr~(4+) and Hf~(4+) has been utilised for the preconcentration and recovery of this ions.