14.Wang Mengmeng（Graduate School of Engineering / Academic Fellow）

Environmental impact of amino acids on the stability of layered double hydroxides after immobilized SeO₄^2-

⁷⁹Se has a 3.27 x 10⁵ years of long half-life and selenate can be immobilized in LDHs based on cement hydration. If the radioactive wastes are released into the soil environment during long-term storage, the adsorbed radionuclides might be possibly contacted with SOM. However, the releasing behaviors of SeO₄^2- from LDHs are still unclear, but important to evaluate its effectiveness. We found smaller sized amino acids have a more serious risk to unstabilize selenate. Carbonate is also another environmentally important threatening factor to the stability of selenate. The necessity of engineering measures to improve the stability of selenate was emphasized.