Competitive Adsorption Properties and Characterization of Mineral Materials to Sr²⁺ and Cs⁺

The competitive adsorption properties of mineral materials were studied by employing the discontinuous process in the same molar concentration Sr²⁺ and Cs⁺ solutions, and then mineral materials adsorbing Sr²⁺ and Cs⁺ were characterized and analyzed by using XRD. The experiment results demonstrate that the equilibrium adsorption time of NF, ZF and CA to Sr²⁺ and Cs⁺ is about 7 d, 3 d and 14 d, respectively. The adsorptive quantity of ZF to Sr²⁺ and Cs⁺ is the greatest, that of NF the second, and that of CA the third. The adsorption of NF to Cs⁺ is the most obviously selective, the selectiveness of CA is comparatively worse, and that of ZF is the worst. The removal efficiency of Sr²⁺ by ZF is about 100%, the removal efficiency of Cs⁺ by ZF reaches 72%; the removal efficiency of Cs⁺ by NF is 66%, but that of Sr²⁺ by NF is only 15%; the removal efficiency of CA to Sr²⁺ comes to 29%, while that of Cs⁺ is only 16%. The crystal unit cell volumes of the mineral materials as well as their crystal unit cell parameters c become smaller after adsorbing Sr²⁺ and Cs⁺, but other crystal unit cell parameters a, b, and β change irregularly.