Abstract

Ion-exchange resin (HBTE-II) was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.2 M), thiourea (0.1 M) and ethylene glycol (0.4 M) at 120 ⁰C. The terpolymer resin was characterized by elemental analysis, the number average molecular weight, UV-Visible, IR and ¹H NMR spectrum. Chelating ion-exchange properties of this copolymer were studied for Bi³⁺, Sb³⁺, Zn²⁺ and Mg²⁺ 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 polymer 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 metal ions were estimated spectrophotometrically. The HBTE-II terpolymer resin was found to be selective chelating ion-exchange resin for Sb³⁺, Bi³⁺ and Zn²⁺.

Keywords

Polycondensation, Ion-exchange, Distribution ratio, Rate of metal ion uptake, Batch-equilibrium method