Abstract
After the treatment of liquid radioactive waste, there is a certain amount of Cs in the waste resin, and these Cs-doped resins are prone to volatilize during the thermal treatment process and cause radionuclide leakage. The molten salt oxidation (MSO) can effectively prevent the volatilization of toxic metal, especially the volatilization of Cs. Under nitrogen and air conditions, it is found that the oxidation behavior between Cs-doped and clean cation exchange resins (CERs) is quite different. In the presence of oxygen and molten carbonate salt, Cs2CO3 is generated by the destruction of functional groups in Cs-doped CERs. The Cs2CO3 in Na2CO3-K2CO3-Li2CO3 reacts with oxygen to form Li2O2, which reduces the content of S in residue from 26.33 to 13.38% in air conditions at 400 °C and promotes the generation of sulfate in the molten carbonate salt. The elements Cs and S in the Cs doped CERs spontaneously form thermally stable Cs2SO4 in the molten carbonate salt.
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The work was financially supported by the Decommissioning of Nuclear Facilities and Special Funds for Radioactive Waste Management ([2019]1276), the National Natural Science Foundation of China (22176045, 21976047 and 21790373), and the University and Local Integration Development Project of Yantai (2020XDRHXMPT36), and the Sino-Russian Cooperation Fund of Harbin Engineering University (2021HEUCRF004).
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Yang-Hai Zheng: methodology, formal analysis, software, writing—original draft, writing—reviewing and editing. Yong-De Yan: conceptualization, resources, investigation, writing—reviewing and editing. Yun Xue: project advisor, validation, formal analysis, writing—reviewing and editing. Yue-Lin Wang: data curation, supervision, conceptualization, writing—reviewing and editing. Xin Liu: data curation, supervision, software, writing—reviewing and editing. Wan-Sheng Mi: formal analysis, conceptualization, methodology, writing—reviewing and editing. Qing-Guo Zhang: methodology, validation, software, data curation, writing—reviewing and editing. Yu Li: supervision, formal analysis, software, writing—reviewing and editing. Fu-Qiu Ma: formal analysis, conceptualization, methodology, writing—reviewing and editing. Mi-Lin Zhang: software, methodology, validation, writing—reviewing and editing. Zhi-Hao Gan: supervision, formal analysis, software, writing—reviewing and editing. Kai Zhu: supervision, sata curation, formal analysis, validation, writing—reviewing and editing.
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Zheng, YH., Yan, YD., Xue, Y. et al. Catalytic effect of cesium on the oxidation behavior of cation exchange resins in Li2CO3-Na2CO3-K2CO3 melt. Environ Sci Pollut Res 29, 64215–64224 (2022). https://doi.org/10.1007/s11356-022-22158-x
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DOI: https://doi.org/10.1007/s11356-022-22158-x