Study on thermodynamic feasibility of uni-univalent ion exchange reactions using nuclear grade anion exchange resin Indion GS-300

The present study deals with the thermodynamics of ion exchange reactions using nuclear grade anion exchange resin Indion GS-300. The ion exchange reactions were performed by separately equilibrating the resin in chloride form with iodide and bromide ion solution of different concentrations at varying temperature. Based on the equilibrium constant (K) values obtained at different temperatures, the enthalpy values for the two ion exchange reactions were calculated. For Cl-/I-ion exchange reaction, the K values were observed to decrease with rise in temperature giving negative enthalpy value (-97.36 kJ/mol) thereby indicating exothermic ion exchange reaction; while for Cl-/Br-ion exchange reaction reverse trend was observed having enthalpy value of 67.66 kJ/mol. Based on the enthalpy values it can be predicted that under identical experimental conditions, by using Indion GS-300 resins, the Cl-/I-ion exchange reaction is thermodynamically more feasible as compared to Cl-/Br-ion exchange reaction.