Abstract: The experiment was conducted to examine the adsorption of Pb²⁺ on the natural mineral. The adsorbent dosage, pH and the reaction time was investigated, and the adsorption isotherm and kinetics equation in the adsorption process was discussed. The results showed that, with the increasing of the adsorbent dosage, the removal rate of Pb²⁺ on the natural mineral was improved at the concentration of 50 mg/L and 100 mg/L gradually, while the saturated adsorption capacity was decreased. The maximum saturated adsorption capacity of natural minerals for heavy metal Pb²⁺ was 87.67 mg/g. The adsorption of heavy metals Pb²⁺ by natural minerals at acidic condition was relatively lower, while the adsorption treatment effect of slightly acidic environment was better. The removal rate of Pb²⁺ increased gradually with the increased of reaction time. The adsorption process of Pb²⁺ accorded with Freundlich adsorption isotherm. Furthermore, the reaction of adsorption on natural mineral to Pb²⁺ matched to the pseudo-second class reaction kinetics model.

Key words: heavy metal Pb²⁺, natural mineral, adsorption property