Study on Kinetics,Isotherm and Thermodynamics of Adsorption of Natural Bentonite to Cu~(2+)

Natural bentonite was used as an adsorbent for the investigation of the adsorption kinetics,isotherms and thermodynamic parameters of Cu2+ from aqueous solution at various contact time,the vibrating rate,mass of bentonite,initial concentration of Cu2+,initial pH and temperature.Adsorption meets the pseudo-second-order kinetic model.The initial stage of the adsorption is controlled by interface diffusion and the adsorption can be followed by intraparticle diffusion model after 45 min.The adsorption follows Freundlich isotherm model.The process is spontaneous,endothermic and irreversible.