Abstract
A potential method of disposing iodine-129 in off-gas produced from spent fuel reprocessing was discussed in this paper. Firstly, the Bi2S3-reduced graphene oxide (RGO) composite was successfully synthesized via a solvothermal method. Secondly, the iodine adsorption process of the Bi2S3-RGO composite was discussed, showing that the iodine was captured by the composite mainly in the form of BiI3 and little in the form of I2. The iodine capturing capacity of the composite is about 1042.8 mg/g, which is much higher than that of other reported inorganic materials. Finally, the iodine immobilization process of the Bi2S3-RGO composite that captured iodine was investigated, indicating that the iodine could be solidified by the glass composite material (GCM) in the forms of BiOI and Bi5O7I.
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