Study on Radiation Effects on AMP/SiO₂ Adsorbent for Separation of Cesium From High Level Radioactive Waste

A silica-based ammonium molybdophosphate (AMP/SiO₂) was successfully applied to remove Cs(I) from radioactive waste water in our previous study. The structure characterization of irradiated AMP/SiO₂ was carried out by X-ray diffraction (XRD). The effect of the initial concentration of metal ions and acidity concentration for removal Cs(I) by irradiated AMP/SiO₂ were investigated. No obvious difference was observed for AMP/SiO₂ with 300 kGy absorbed dose from the XRD patterns, except the slightly shift of (110) peak toward a small angle. Relatively large distribution coefficient (8×10³cm³/g) of Cs(I) was obtained in 3M HNO₃ by irradiated AMP/SiO₂. The maximum adsorption capacity of AMP/SiO₂ irradiated at 300 kGy was estimated as 22.4 mg/g. The loss of molybdenum from AMP/SiO₂ in 3 M HNO₃ with 200 kGy absorbed dose is less than 5%.