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Use of microwave closed-loop desorption method to evaluate the desorption characteristics of activated carbon absorbed radon

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Abstract

Activated carbon is a promising radon adsorbent. The desorption and recycling of activated carbon absorbed radon are of great significance to radon reduction and removal. In this paper, we proposed the closed-loop microwave desorption method of activated carbon. Specifically, we examined the percentage of mass loss, time and efficiency of desorption of the activated carbon absorbed radon in the microwave field. Our results show that the activated carbon loss percentage increases with the increase of gas flow rate and the mass loss percentage of activated carbon is lower in the closed-loop compared to it is in the open-loop desorption mode. The maximum cumulative loss percentage after nine consecutive desorption cycles of the activated carbon were 13.4 and 2.6% under the open- and closed-loop models, respectively. At the flow rate of 4, 8, 12 and 16 L min−1, in the closed-loop regeneration method, the static adsorption coefficients after nine adsorption–desorption cycles were 4.8, 6.1, 10.7 and 12.3% higher than that in the open-loop, respectively. The desorption efficiency of activated carbon adsorbed radon in the closed-loop method was 94.6–98.9%. Likewise, the activated carbon absorbed low 222Rn concentration (600 Bq m−3) can be desorbed completely in 45–50 min.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (12075112).

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Authors and Affiliations

  1. School of Nuclear Science and Technology, University of South China, Hengyang, 421001, Hunan, People’s Republic of China

    Songbo Tan, Jian Shan, Fengdi Qin & Xiyu Yang

  2. Cancer Center of Xiamen Humanity Hospital, Xiamen, 361016, Fujian, People’s Republic of China

    Songsong Li

  3. Nuclear Power Institute of China, Chengdu, 610213, Sichuan, People’s Republic of China

    Guohui Wang

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  1. Songbo Tan
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  2. Jian Shan
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  3. Songsong Li
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  4. Fengdi Qin
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Correspondence to Jian Shan.

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Tan, S., Shan, J., Li, S. et al. Use of microwave closed-loop desorption method to evaluate the desorption characteristics of activated carbon absorbed radon. J Radioanal Nucl Chem 331, 1785–1793 (2022). https://doi.org/10.1007/s10967-022-08243-y

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  • DOI: https://doi.org/10.1007/s10967-022-08243-y

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