Investigation of the chemical and radiation stability of titanium dioxide with surface arsenate groups during 90Sr adsorption

The chemical and radiation stability of titanium dioxide with surface arsenate groups during 90Sr adsorption has been studied. The oxalate technique has been used to obtain a solution containing 90Sr from the objects of the aquatic environment of the Chornobyl Exclusion Zone. The dependence of the strontium adsorption on the acidity of the solution and the initial activity of the solution (Bq per mL) has been shown. SEM, XRF, and EDS spectroscopy confirm the chemical resistance of 4As–TiO2 during regeneration. According to the study with 90Sr, the decrease in the adsorption capacity of 4As–TiO2 during regeneration is associated with incomplete leaching of strontium from 4As–TiO2 micropores.