Study on Deactivation Mechanism of Radioactive Methyl Iodide Adsorbed by Impregnated Activated Carbon
ZHANG Jiaqian1,2,3, WANG Kunjun4,*, YANG Chao3,5, YANG Song2,3, SHANGGUAN Ju1,3, WANG Bingning1,2,3, LIU Shoujun2,3
1 State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China 2 College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China 3 Shanxi Civil Clean Fuel Engineering Research Center, Taiyuan 030024, China 4 Department of Environmental Engineering Technology, China Institute for Radiation Protection, Taiyuan 030006, China 5 College of Environmental Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Abstract: Impregnated activated carbon (IMAC) is used in the ventilation and purification system of nuclear power plant to absorb radioactive gaseous iodide produced by nuclear reaction, so as to ensure the safety of environment and personnel. The adsorption efficiency of IMAC decreases obviously after long time continuous use. A clear understanding of the inactivation mechanism of IMAC is significant for prolonging its service life and subsequent high-value utilization research. Based carbon, impregnated activated carbon and deactivated activated carbon were selected as the research objects. The microstructure and phase composition of the sample activated carbon were analyzed, and the change law before and after IMAC deactivation was discussed, and the mechanism of deactivation was inferred. The results showed that triethylenediamine (TEDA) as the main active component in IMAC, partially reacted with methyl iodide to form quaternary ammonium salt, and TEDA was easily decomposed, and its content was reduced by more than 90%. The oxidizing substances in the environment and oxygen-containing functional groups on the surface of IMAC cause different degrees of oxidation on activated carbon. Meanwhile, the total pore volume occupied by micropores decreases from 85% to less than 40%, and the methyl iodide adsorption sites decrease. Due to the above reasons, the surface structure of IMAC is changed, the active site is reduced, and the adsorption efficiency is decreased.
张佳倩, 王坤俊, 杨超, 杨颂, 上官炬, 王冰凝, 刘守军. 浸渍活性炭吸附放射性碘甲烷后失活机理研究[J]. 材料导报, 2024, 38(7): 22090123-5.
ZHANG Jiaqian, WANG Kunjun, YANG Chao, YANG Song, SHANGGUAN Ju, WANG Bingning, LIU Shoujun. Study on Deactivation Mechanism of Radioactive Methyl Iodide Adsorbed by Impregnated Activated Carbon. Materials Reports, 2024, 38(7): 22090123-5.
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2024, Vol. 38 
