Abstract

The Brazilian commercial acid clay capacity to remove Cu2+ from aqueous solutions was investigated. Pretreatment of clay, initial copper concentrations, contact time and kind of copper salts, namely chloride, nitrate and sulfate were studied. The results show that the clay was effective in removing the copper from aqueous solutions in few minutes. In the dilute solutions, the clay pretreatment or type of copper salts had no influence on the capacity of adsorption. On the other hand, in the concentrated solutions, the better result was obtained in the presence of copper nitrate. The structural characteristics of the commercial and intercalated Cu-clays were determined by XRD and Solid State NMR.

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