Kinetics of 90Sr Sorption from Aqueous Solutions by Termoxid-3K Carbonate-Containing Zirconium Hydroxide Sorbent

The regularities of kinetics of Sr-90 sorption from a natural low saline water by Termoxid-3K inorganic sorbent have been studied. The effect of solution stirring rate, strontium concentration and temperature on the sorption rate constant, diffusion coefficients and kinetic regime was investigated, and the experimental results were modeled by diffusion and chemical kinetics models. The sorption of strontium by sorbent T-3K has a two-stage character, proceeds in the intra-diffusion mode with limiting contribution at stage 1 of the chemisorption process. Strontium diffusion coefficients were 10–12–10–13 m2/s, activation energy was 93.3 kJ/mol at stage 1 of sorption, and 23.8 kJ/mol at stage 2.