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Removal of heavy metals from aqueous solution by bentonite

Belkacem Benguella

The adsorption onto bentonite of three heavymetals often found in industrial effluents (chromium, iron and zinc) was studied. The kinetic equilibrium data showthat the bentonite fixesmore chromium(VI) than iron (II) and zinc (II). The adsorption capacities of heavy metals in equilibrium with the bentonite are influenced by the stirring speed and environment temperature. The thermodynamic parameters obtained indicate that the adsorption of heavy metals onto bentonite is a spontaneous and exothermic process.