A RADIOCHEMICAL STUDY ON THE THERMODYNAMICS OF CESIUM ADSORPTION ON POTASSIUM COPPER-NICKEL HEXACYANOFERRATE(II) FROM AQUEOUS-SOLUTIONS

This paper reports a radiochemical study on the thermodynamics of cesi um adsorption on potassium copper nickel hexacyanoferrate(II) (KCNF) u sing Cs-134 radionuclide as a radiotracer. The values of thermodynamic parameters like Delta H degrees, Delta S degrees and Delta G degrees have been calculated using the temperature dependence of cesium adsorp tion on KCNF. These values indicate the endothermic nature of the adso rption process. Freundlich and Langmuir izoterms have shown their appl icability for the adsorption of cesium on KCNF at different temperatur es and their corresponding constants have been calculated and interpre ted. The Dubinin-Radushkevich (DR) equation has also been applied to t he adsorption data and the values of mean free energies of the adsorpt ion process at different temperatures have been evaluated. These value s indicate that the adsorption of cesium on KCNF is expected to follow an ion exchange process.