Abstract
A raw bentonite, obtained from Maghnia (Western Algerian) was impregnated into 1M ammonium chloride solution and thermally treated in a furnace at 200 °C during one hour. This treatment has improved its removal capacity of copper from aqueous solutions to about 30 %. The performances of the copper adsorption of this new material, after its physicochemical treatment, were evaluated by quantitative analysis on the copper remaining in the solution. The interface phenomena of bentonite- Cu2+ aqueous solution adheres to the Langmuir and Freundlich models. The adsorption energy, calculated by using Dubinin-Radushkevich equation, has proved that the removal of copper with this clay material is an ion exchange process. Nevertheless, the thermal treatment of this clay has inhibited the temperature effect on the retention of copper ions. Thus, the kinetic law governing the copper adsorption described here is following a second order model.
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