Influence of Aqueous Environment on the Adsorption of ²³⁹Pu on GMZ Bentonite

The adsorption of ²³⁹Pu on Gaomiaozi(GMZ) bentonite was studied in different ionic environment by the static adsorption experiment. The influence of the contact time, pH, the different kinds of ions and ionic concentration on the adsorption behavior was also studied. The experimental results show the adsorption ability of ²³⁹Pu on GMZ bentonite is good, and the adsorption rate is fast, four days it can achieve adsorption equilibrium. The adsorption capacity of bentonite to ²³⁹Pu increases with increasing of pH value in water phase. The adsorption of ²³⁹Pu on GMZ bentonite is strongly hindered by CO₃^2-, Fe³⁺ and Ca²⁺. The K_d value increases with the concentration increasing while ionic concentration less than 0.02 mol/L. The K_d value is not affected by ionic concentration while ionic concentration more than 0.02 mol/L.