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 themodynamics of cesium adsorption on potassium copper nickel hexacyanoferrate(II) (KCNF) using¹³⁴Cs radionuclide as a radiotracer. The values of themodynamic parameters like H ^o , S ^o and G ^o have been calculated using the temperature dependence of cesium adsorption on KCNF. These values indicate the endothermic nature of the adsorption process. Freundlich and Langmuir izotems have shown their applicability for the adsorption of cesium on KCNF at different temperatures and their corresponding constants have been calculated and interpreted. The Dubinin-Radushkevich (D-R) equation has also been applied to the adsorption data and the values of mean free energies of the adsorption process at different temperatures have been evaluated. These values indicate that the adsorption of cesium on KCNF is expected to follow an ion exchange process.