Thermodynamics of Ion Exchange Reaction in Predicting the Ionic Selectivity Behavior of UV Radiation Degraded Nuclear-grade and Non-nuclear Grade Resins

Abstract

The study represents the evaluation of performance of structurally related resins DuoliteARA 9366 and Duolite A-378 exposed to UV radiations of wavelength λ=254nm and λ = 384nm for 24 h in a UV Chamber and equilibrated separately with iodide ion solutions of different concentrations between temperature of 30.0oC - 45.0oC for 5 h .the equilibrium constants (K) values for Cl-/I- reactions with temperature for DuoliteARA-9366 were decreases from 21.57 x 10-2 to 15.57 x 10-2 for resin degraded at UV radiation of 384nm was lower than the decrease in K values from 26.22 x 10-2 to 19.92 x10-2 observed for the resin degraded at UV radiation of wavelength λ=254nm. Similar results were obtained for DuoliteA378 .The UV degradation of the resin surfaces were recognized by SEM and IR. The high K and low enthalpy values obtained for DuoliteARA-9366 shows that DuoliteARA-9366 was more selective towards iodide ions in solution than DuoliteA-378.