Development of a two parameter temperature-dependent semi-empirical thermodynamic ion exchange model using binary equilibria with Amberlite IRC 748 resin

Abstract

A chelating ion-exchange resin, Rhom and Haas Amberlite IRC 748, was investigated for the exchange of copper and sodium from aqueous solutions at four different temperatures. A two-parameter temperature-dependent, semiempirical thermodynamic ion exchange model was used to describe binary systems involving the ions Cu2+, Na+, and H+. To ensure that all experiments were conducted on purely binary systems, the resin was preconditioned into the hydrogen form. All experiments were conducted with Cl- as the nonexchanging anion and at temperatures of 4.0, 12.0, 20.0, and 40.0 ± 0.1 °C. The semiempirical thermodynamic ion exchange model was shown to predict the shape of the equilibrium ion exchange ..