Removal of Lead (II) Ions from Aqueous Solutions using Calcium Carbonate Modified Diatomite

Abstract

This study attempted to improve the adsorption performance of diatomite for the removal of lead (II) ions from wastewaters through modification with Calcium carbonate. The removal of lead (II) ions from aqueous solution was studied using Calcium carbonate modified samples at different condition, including adsorbent dosage, pH and initial concentration of lead (II) ions. Calcium carbonate modified diatomite adsorption isotherms and adsorption kinetics were also studied. The adsorption isotherms and the kinetic data are best-fit with the Langmuir model and pseudo-second-order kinetics, respectively. Our results show that these Calcium carbonate modified diatomite exhibit significant adsorption activities for lead (II) ions in aqueous solutions.