Adsorption studies of cesium on a new inorganic exchanger ammonium molybdophosphate - alumina (AMP - Al2O3)

The applicability of ammonium molybdophosphate-alumina (AMP-Al2O3) for the efficient removal of Cs from aqueous solution by adsorption has been invest igated. The kinetics of adsorption of cesium ions has been studied by using radioanalytical procedure over a concentration range of 10(-4)-10(-2) mol. dm(-3) and in the temperature range of 303-318 K. The results showed that t he uptake follows the first order rate law with respect to cesium concentra tion and obeys Langmuir and modified Freundlich adsorption isotherm in the concentration range studied. Equilibrium adsorption values at different tem peratures have been utilised to evaluate change in standard thermodynamic p arameters (Delta H-0, Delta G(0) and Delta S-0). From the thermodynamic par ameters it is found that the process is exothermic in nature.