ADSORPTION OF RADIOCOBALT ON LEAD DIOXIDE FROM AQUEOUS-SOLUTION

Adsorption of cobalt on lead dioxide from aqueous solutions has been s tudied in relation to shaking time, amount of adsorbent, pH, and conce ntration of the adsorbate. The data fitted very well Langmuir, Freundl ich, and Dubinin-Radushkevich isotherms and their corresponding consta nts were calculated. In another set of experiments the influence of di fferent anions and cations on the adsorption of cobalt under the optim um experimental conditions have been determined. EDTA, tartrate, citra te, thiocyanate, oxalate, U(VI), Al(III), Fe(III), Cr(III), and Th(IV) , drastically reduced adsorption of cobalt. Therefore these anions and cations should be removed before adsorption of cobalt on lead dioxide . Adsorption of other metal ions on the oxide were measured under iden tical conditions. The K(D) values indicate that cobalt can be separate d successfully from Hg(II), Ag(I), Ta(V), In(III) and Tc(VII).