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Copper and zinc removal from aqueous solution by mixed mineral systems II. The role of solution composition and aging
D E Egirani1, A R Baker, J E Andrews
1School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, United Kingdom. eenonidavidson@hotmail.com
Abstract:
This study investigates Cu and Zn removal onto binary mixed mineral sorbents from simulated wastewater, relevant to streams impacted by acid mine drainage and effluents. Mixed suspensions of kaolinite/montmorillonite and kaolinite/goethite exhibited different sorption behavior from the single mineral components, reducing Cu and Zn removal (except Cu sorbed on montmorillonite/goethite) over the range of pH investigated. Cu and Zn removal by the electrolyzed systems showed a complex response to increased ionic strength, which increased solid concentration, leading to lower Cu and Zn sorption. Enhanced Cu sorption on the montmorillonite/goethite as age increased may be attributed to increased hydroxylation of the mineral surface resulting in the formation of new reactive sites.
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