浸渍活性炭吸附放射性碘甲烷后失活机理研究

doi:10.11896/cldb.22090123

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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.

Key words： impregnated activated carbon methyl iodide triethylenediamine (TEDA) micropore deactivation

Published: 10 April 2024 Online: 2024-04-11

CLC number:

TL941

Fund:National Natural Science Foundation of China (21878210),the Shanxi Provincial Patent Transformation Special Plan Project (202202054),the China National Nuclear Corporation Science Fund for Talented Young Scholars (CNNC-2021-28),Shanxi Provincial Special Program for Guiding Transformation of Scientific and Technological Achievements(202104021301052).

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	Articles by authors
	ZHANG Jiaqian
	WANG Kunjun
	YANG Chao
	YANG Song
	SHANGGUAN Ju
	WANG Bingning
	LIU Shoujun

Cite this article:

ZHANG Jiaqian,WANG Kunjun,YANG Chao, et al. Study on Deactivation Mechanism of Radioactive Methyl Iodide Adsorbed by Impregnated Activated Carbon[J]. Materials Reports, 2024, 38(7): 22090123-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22090123 OR http://www.mater-rep.com/EN/Y2024/V38/I7/22090123

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