Study on Deactivation Mechanism of Radioactive Methyl Iodide Adsorbed by Impregnated Activated Carbon

被引：0

作者：

Zhang J. ^{[1
,2
,3
]}

Wang K. ^{[4
]}

Yang C. ^{[3
,5
]}

Yang S. ^{[2
,3
]}

Shangguan J. ^{[1
,3
]}

Wang B. ^{[1
,2
,3
]}

Liu S. ^{[2
,3
]}

机构：

[1] State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan

[2] College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan

[3] Shanxi Civil Clean Fuel Engineering Research Center, Taiyuan

[4] Department of Environmental Engineering Technology, China Institute for Radiation Protection, Taiyuan

[5] College of Environmental Engineering, Taiyuan University of Technology, Taiyuan

来源：

Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 07期

基金：

中国国家自然科学基金;

关键词：

deactivation; impregnated activated carbon; methyl iodide; micropore; triethylenediamine (TEDA);

D O I：

10.11896/cldb.22090123

中图分类号：

学科分类号：

摘要：

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. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.

引用

共 23 条

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