Resin. III. Synthesis, characterization, and ion‐exchange properties of a 2,2′‐dihydroxybiphenyl–formaldehyde copolymer resin

Abstract

Abstract A 2,2′‐dihydroxybiphenyl–formaldehyde copolymer, synthesized by the condensation of 2,2′‐dihydroxybiphenyl with CH 2 O in the presence of an acid catalyst, proved to be a selective chelating ion‐exchange copolymer for certain metals. The chelating ion‐exchange properties of this copolymer were studied for Fe(III), Cu(II), Ni(II), Zn(II), 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 the 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(III), Cu(II), and Ni(II) ions than for Co(II), Zn(II), Cd(II), and Pb(II) ions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008