Synthesis, characterization and ion-exchange properties of 4-hydroxyacetophenone, biuret and formaldehyde terpolymer resins

Terpolymer resins (4-HABF) were synthesized by the condensation of 4-Hydroxy acetophenone and biuret with formaldehyde in the presence of acid catalyst and using varied molar ratios of reacting monomers. Terpolymer resin compositions have been determined on the basis of their elemental analysis and the number average molecular weights of these resins were determined by conductometric titration in non-aqueous medium. Viscometric measurements in dimethyl formamide (DMF) have been carried out with a view to ascertaining the characteristic functions and constant. UV-Vis, IR and NMR spectra were studied to elucidate the structure. Chelation ion-exchange properties of this resin have also been studied employing batch equilibrium method. It was employed to study selectivity of metal ion uptake over a wide pH range and in media of various ionic strength. The overall rate of metal uptake follows the order: Fe3+ > Cu2+ > Ni2+ > Co2+ = Zn2+ > Cd2+ > Pb2+ > Hg2+. (C) 2003 Elsevier Science B.V. All rights reserved.