Removal characteristics of cadmium ion by waste egg shell

Waste egg shell is used as adsorbent to treat cadmium bearing wastewater. C haracteristics of cadmium ion removal by egg shell in synthetic wastewater was investigated for various parameters. This study shows the effect of rea ction time, the amount of egg shell, concentration of cadmium ion, the size of egg shell, temperature and solution pH on the extent of cadmium ion ads orption from solution. Adsorption increased with the increase in reaction t ime, the amount of egg shell, temperature and pH. But the amount of adsorpt ion decreased according to the increase in the egg shell size. This study a lso examines the adsorption isotherm and reaction kinetics for cadmium ion. The adsorption process was found to have a tendency to be endothermic and the adsorption isotherms for cadmium ion could be fitted closely by the Fre undlich model.