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Adsorption of Sm3+, La3+ and Ce3+ ions from aqueous solutions onto polyacrylamide ferric antimonate. Thermodynamic parameters such as ΔG*, ΔS* and ΔH* have been calculated for the adsorption of Sm3+, La3+ and Ce3+ ions onto ion exchange material. Attention was paid to study the adsorption competitive and the effect of coexistent ions onto adsorption behaviours. coexistent ions including Na+, Mg2+ and Ca2+ inhibited the adsorption of Sm3+, La3+ and Ce3+ ions onto polyacrylamide ferric antimonate, because they competed for adsorption sites. The physicochemical properties of the material were determined using AAS, ICPs elemental analysis, IR, TGA-DTA and XRD study. The selectivity coefficients of different cations were determined by mixed solution method which were found to be less than unity. The distribution study revealed that the cation-exchange material has a high selectivity for Sm3+. Due to selective nature for cation-exchange material, absorption process was affected by the presence of competing cations and was observed that it reduced with increase in the concentration of competing cations in the suspension which may be probably due to the competition between these ions.