Assessment of nano-sized stannic silicomolybdate for the removal of 137Cs, 90Sr, and 141Ce radionuclides from radioactive waste solutions

Abstract

Synthesized nano-sized stannic silicomolybdate was tested for the adsorption of 137Cs, 90Sr, and 141Ce radionuclides from radioactive waste solutions using batch experimentations in single metal solution. The sorption examinations were performed under the effect of some key parameters such as (pH, contact time, initial metal concentration, adsorbent weight, and temperature). Isothermal records were found to be well fitted with Langmuir adsorption model. The evaluated mean adsorption energy from the D–R isotherm model has been achieved as 18.25, 34.92, and 37.47 kJ mol−1 for 137Cs, 90Sr, and 141Ce radionuclides respectively, further conferring to the chemical process of the adsorption. The adsorption interaction of 137Cs, 90Sr, and 141Ce radionuclides onto SnSiMo obeyed pseudo–second–order rate equation. The adsorption process was controlled by particle diffusion mechanism, while intraparticle diffusion was not only the rate-limiting step. The positive values obtained for the entropy of activation suggest that there is an important change occurring in the internal structure of SnSiMo throughout the adsorption procedure.