The effect of the adsorption of lead and cadmium ions on the interfacial behavior of quartz and talc

Because of its importance in the fields of environmental and mineral engine ering, study of metal ion adsorption on silicate minerals has received exte nsive continuing interest. However, limited work has been done to compare t he behavior of silicates that are hydrophilic with those that are naturally hydrophobic. Our investigation was undertaken to provide a better understa nding of the effect of hydrophobicity and surface heterogeneity on the adso rption of hydrolyzable metal ions (Pb and Cd) at the solid/liquid interface . Concurrent measurements of zeta potentials, the extent of the adsorption, and suspension stability were conducted on colloidal suspensions of two si licate minerals, namely naturally hydrophilic quartz and hydrophobic talc. (C) 2001 Elsevier Science B.V. All rights reserved.