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The main objective was to study the removal of lead cations from aqueous solutions by sorption onto bentonite and its modificati ons. Modification included natrification by NaCl and intercalation by octadecylamine (ODA) in two different weight ratios. The sorption isotherms were described using the Langmuir and Freundlich models. The adsorptive capacities of the or iginal bentonite increased af ter the intercalation of ODA. Adsorption of Pb ions, calculated by the La ngmuir model, yielded 97.15mg of Pb ions on 1g ...