Temperature and Concentration Dependence of Kinetics of Thorium Adsorption on Activated Charcoal from Aqueous Solutions

The batch kinetics of thorium ions adsorption on activated charcoal from aqueous solution has been investigated at temperatures within the range of 283-313K and concentration (0.5-3.0 g/1). The thorium ions adsorption obeys a first order rate law, with an activation energy 13.40 kJ/mol. Various thermodynamic quantities (namely H, S, G) were computed from the equilibrium constant, kc values calculated at different temperatures. The results indicate that the process has an endothermic heat of adsorption. Moreover, thorium ions adsorption obeys the Freundlich and Langmuir equations especially the latter provide the better fit over the entire range of concentration studied.