Chelation ion-exchange properties of a copolymer derived from 2-hydroxyacetophenone, oxamide, and formaldehyde

Copolymers (2-HAOF), synthesized by the condensation of [GRAPHICS] and H2N(O)CC(O)NH2 with CH2O in the presence of acid catalyst, proved to be selective chelating ion-exchange copolymers for certain metals. The chelating ion-exchange properties of this copolymer were studied for Cu(II), Ni(II), Co(II), Zn(II), Fe(III), Cd(II) and Pb(II) ions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake involving the measurements of the distribution of a given metal ion between the copolymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The copolymer showed a higher selectivity for Fe(Ill), Cu(II) and Ni(II) ions than for Co(II), Zn(II), Cd(II) and Pb(II) ions.