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Leaching behavior of iodine anion from metakaolinite-sodium-silicate-based geopolymer

Kozai, Naofumi; Utsunomiya, Satoshi*; Onuki, Toshihiko*

$$^{129}$$I is one of the most important fission products for safety assessment of radioactive waste repositories. This study investigated basic characteristics of a cement-alternative material candidate, "geopolymer (GP)", on iodine (I$$^{-}$$ and IO$$_{3}$$$$^{-}$$) confinement. It was found that representative GP, metakaolinite- sodium silicate - based GP, has no ability to chemically retain those iodine anions. I$$^{-}$$ was easily leached from GP solidified bodies. Approximately 80% of IO$$_{3}$$$$^{-}$$ was retained by GP solidified bodies, which was probably due to physical confinement in the polymer structure. Amount of iodine anions that can be solidified in GP solidified bodies was small since iodine anions do not much dissolve in the liquid used for GP synthesis. However, we also found that a larger amount of iodine anions can be solidified by iodine anions adsorbing layered double hydroxide is solidified in geopolymer.

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