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The retentions of Zn, Cd and Pb cations by one treated bentonite up to 750 °C were analyzed. The retentions were evaluated by using mono-and poly-solute aqueous solutions of such cations. The adsorptions were carried out in batch system at room temperature. The solid/liquid ratio was 2% wt.v -1 . The solids were characterized by X-ray diffraction, thermal and chemical analyses. The Zn cation from mono-or polysolute-solutions was retained in higher amount than Cd and Pb cations in similardoi:10.1590/s1516-14392012005000074 fatcat:6wjpx5gkbzb6jp7jktbv5m5sdi