Use of a Two Parameter Temperature Dependant Semi-Empirical Thermodynamic Ion Exchange Model

Abstract

A chelating ion exchange resin, Amberlite IRC 748 was investigated for the exchange of copper and sodium from aqueous solutions at three temperatures. A two parameter temperature dependant semi-empirical thermodynamic ion exchange model was used to describe binary systems involving the ions Cu²⁺ and Na⁺. All experiments were conducted with Cl^- as the non-exchanging anion and at temperatures of 4.0, 20.0 and 40.0±0.1°C. The semi-empirical thermodynamic ion exchange model was shown to predict the shape and position of the ion exchange curves accurately. There was a consistent increase in selectivity of the resin towards copper with an increase in temperature.