Jung Young Eun, Yang Jae Hwan, Yim Man-Sung
Advanced Fuel Cycle Technology Division, Korea Atomic Energy Research Institute, 111 Daedeok-daero, 989 beon-gil, Yuseong-gu, Daejeon 34057, South Korea.
Department of Environmental & IT Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, South Korea.
J Hazard Mater. 2024 Apr 5;467:133777. doi: 10.1016/j.jhazmat.2024.133777. Epub 2024 Feb 12.
In this study, we investigated the use of Bi-mna, a specific type of bismuth metal organic framework (MOF) for the capture and disposal of iodine, a key nuclide of concern in nuclear fuel reprocessing plants and nuclear power plants. To find the suitable form of Bi-mna for the purpose, experiments were performed by synthesizing four different Bi-mna with varying reagent ratios and connecting iodine adsorption and conversion for immobilization. After iodine adsorption and characterization to investigate their adsorption mechanisms, the Bi-mna samples went through conversion for immobilization to fix captured iodine into the adsorbents. The converted materials are characterized to examine their thermal stability. The Bi-2mna, showing the best performance of adsorption and thermal stability after the conversion, was selected to explore its chemical stability. According to the test results, the converted compound showed relatively low leaching rate (3.06 ×10 g/m∙day) compared with other iodine containing waste forms for disposal. Based on the results, we proposed the Bi-2mna as a candidate material as iodine adsorbent as well as waste form precursor. ENVIRONMENTAL IMPLICATION: Radioiodine a key nuclide of concern in nuclear fuel reprocessing plants and nuclear power plants. Once ingested, it is accumulated in thyroid grand, causing negative health effects. Currently, a typical radioiodine adsorbent is silver-based zeolites. Despite a strong affinity to iodine of silver, it has a chemical toxicity that causes a potential issue in disposal. Therefore, it is substantially required to develop new type of adsorbents which are both good for capture and disposal of radioiodine. In this respect, we suggested a bismuth-based metal-organic framework as an alternative adsorbent to manage the life cycle of radioiodine.
在本研究中，我们研究了双金属铋纳米片（Bi-mna）的用途，它是一种特定类型的铋金属有机框架（MOF），用于捕获和处置碘，碘是核燃料后处理厂和核电站中一个关键的放射性核素。为了找到适合该用途的Bi-mna形式，我们通过合成四种不同试剂比例的Bi-mna并连接碘吸附和转化以进行固定化来进行实验。在进行碘吸附和表征以研究其吸附机制后，Bi-mna样品进行转化固定化，将捕获的碘固定在吸附剂中。对转化后的材料进行表征以检查其热稳定性。选择转化后吸附性能和热稳定性最佳的Bi-2mna来探索其化学稳定性。根据测试结果，与其他用于处置的含碘废物形式相比，转化后的化合物浸出率相对较低（3.06×10 g/m∙天）。基于这些结果，我们提出将Bi-2mna作为碘吸附剂以及废物形式前驱体的候选材料。环境意义：放射性碘是核燃料后处理厂和核电站中一个关键的放射性核素。一旦摄入，它会在甲状腺中积累，对健康产生负面影响。目前，典型的放射性碘吸附剂是银基沸石。尽管银对碘有很强的亲和力，但它具有化学毒性，在处置时会引发潜在问题。因此，迫切需要开发新型吸附剂，既能有效捕获又能处置放射性碘。在这方面，我们建议使用铋基金属有机框架作为替代吸附剂来管理放射性碘的生命周期。
