Influence of the morphological structure of macroreticular amidoxime resins on their complexation capacity

Macroreticular chelating resins containing, amidoxime groups were synthesiz ed by aqueous suspension copolymerization of acrylonitrile (AN) and divinyl benzene (DVB) and subsequent chemical modification of cyano groups by react ion with hydroxylamine. In the copolymerization, the effects of divinylbenz ene proportion and dilution degree on the copolymer pore structure were inv estigated. Gelatin and calcium carbonate were used as suspension stabilizer s and sodium sulphate was added in order to reduce acrylonitrile solubility in water, by salting out effect. The copolymers (AN/DVB) and amidoxime res ins (RNH/DVB) obtained were characterized by apparent density, surface area , pore volume, optical appearance, surface morphology and by nitrogen conte nt. The amidoxime resins were finally evaluated in relation to the complexa tion capacity of copper ion. (C) 2001 Elsevier Science BY All rights reserv ed.