Carbonate hydroxylapatite ( CHAP), prepared from abandoned eggshell, was used to remove Pb^2+ from simulated wastewater. The factors that might influent the adsorption performance of CHAP were investigated, such as pH values, adsorption time, reaction temperature, CHAP dosage and the initial concentration of Pb^2+. The results showed that when CHAP dosage was 0.6g/L and initial concentration of Pb^2+ was at 750 mg/L, the removal ratio of Pb^2+ by CHAP adsorption could reach up to 99.9%, and the adsorption capacity was up to1243. 75 mg/g. ...