Experimental study of the adsorption of Zn2+ ions on natural calcium carbonate

Abstract

From an aqueous solution, Zn2+ was adsorbed in batches on natural calcium carbonate (NCC) characterized by X-ray diffraction in aqueous solution. The effects of temperature, initial concentration of the solution, contact time, pH of the solution, stirring rate and adsorbent masses were studied as experimental parameters. Knowing that the adequate equilibrium time for the adsorption of Zn2+ on natural calcium carbonate was 80 minutes, it is noted that this adsorption is favoured by a basic pH and an average agitation rate. The experimental data were analyzed by the linear form of Langmuir and Freundlich. The results show a good correlation with the isothermal model of Langmuir. The adsorption kinetics studied by the first-order and second-order kinetic equation, it found to follow the pseudo-second-order equation.