Kinetic Relationships of Sr Sorption from Aqueous Solutions by Carbonate-Containing Zirconium Hydroxide Termoxid-3K

The kinetic relationships of the Sr sorption from fresh water by Termoxid-3K inorganic sorbent were studied. The influence of the solution stirring rate, strontium concentration, and temperature on the sorption rate constant, diffusion coefficients, and kinetic regime was investigated, and the experimental results obtained were modeled using models of diffusion and chemical kinetics. The strontium sorption onto T-3K sorbent has a two-stage character and proceeds in the internal diffusion mode with a limiting contribution of the chemisorption process in the first stage. The diffusion coefficients of strontium were 10–10 m/s, and the activation energy in the first stage of sorption was 93.3 and at the second stage, 23.8 kJ/mol.