We studied sorption of cadmium and cobalt(II) ions from model solutions on natural and thermally processed Na-bentonite at the range 20–65⁰C. In different temperatures on both natural and Na-bentonites equilibrium constants of sorption amount of Co²⁺ and Cd²⁺ ions were calculated. It was determined that when the temperature increases sorption efficiency of sorbents increases towards the ions. In all cases at high density and temperature sorption efficiency of Cd²⁺ was higher than Co²⁺ ions.  By cation exchange method we have determined that modified form of bentonite has a higher sorption capacity, equilibrium coefficient of distribution and sorption selectivity of metal cations. It was found out that during ion exchange swelling ability and exchange capacity of bentonite samples have incredibly changed.