Cadmium adsorption on Al-pillared montmorillonite

Results of acido-basic titration of aluminium pillared montmorillonite shows that surface hydroxilic groups of pillared clay (heavy metals adsorption sites) are different to hydroxilic alumina surface groups, showing the abcence of alumina pillar in the interlamellar space. In this work we propose the cadmium adsorption mechanism by the study of cadmium adsorption isotherms at different pH. Kinetic study show that pillared clay needs 7 days to adsorb a maximum quantity of heavy metal. We also show the utility of using clay as matrix of aluminic pillar in their adequate form to fix heavy metals.