Synthesis and performance evaluation of AgNbO₃/Al₂O₃ high-temperature-resistant adsorbent for radioiodine

A kind of high temperature resistant adsorbent for radioiodine, AgNbO₃/A1₂0₃, was synthesized with the method of mechanical mixing. Compared with traditional silver adsorbent (Ag/A1₂0₃), AgNbO₃/A1₂0₃ adsorbent shows more stable performance at high temperatures. Particularly, the decontamination factor of this adsorbent is far more than that of traditional silver adsorbent at temperatures higher than 650℃. Characterization data show the structure of the adsorbent is stable, and it can endure long time high temperature calcination. Results of thermogravimetric analysis and iodine desorption indicate that the enhancement of stability of silver iodine on AgNbO₃/A1₂0₃ adsorbent is the reason why AgNbO₃/Al₂O₃ adsorbent has better performance at high temperatures. This adsorbent may be used in nuclear accident for emergency disposal. (authors)