Radon adsorption performance of regenerated pre-oxidized nitrogen-doped activated carbon

IF 1.7 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2026-08-08 DOI:10.1007/s10967-026-11064-y

Siyv Li, Guoqing Liu, Yong Liu, Yourui Jiang, Yupeng Xie, Tao Qiu, Shengyang Feng

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引用次数: 0

Abstract

Radon (Rn) is a widely recognized human carcinogen, and modified activated carbon is one of the most effective adsorbents for radon removal. Regeneration of radon-saturated activated carbon is essential to reduce secondary pollution and improve material utilization. In this study, pre-oxidized nitrogen-doped activated carbon (FeN-AC) was regenerated under water-containing and dry thermal conditions at 400 ℃, yielding four samples: T1V-400, T2V-400, D1V-400, and D2V-400. The radon dynamic adsorption coefficients were measured to evaluate regeneration performance. Results showed that T1V-400, obtained by water-assisted regeneration for 30 min, exhibited the best recovery efficiency, reaching 92.5% of the radon adsorption capacity of fresh FeN-AC, which was 7.0%, 10.0%, and 21.6% higher than that of D1V-400, D2V-400, and T2V-400, respectively. Based on the BET and XPS characterization analysis, the recovery rate of radon adsorption is jointly influenced by the pore structure, the content and ratio of nitrogen and oxygen. Higher nitrogen content, a lower N/O ratio, and a better microporous structure are conducive to increasing the adsorption and recovery rate of radon. Kinetic analysis indicated that the adsorption process of regenerated samples was dominated by physical adsorption and surface adsorption, consistent with the original FeN-AC. This work reveals the synergistic effects of pore structure and surface chemistry on radon adsorption recovery, and provides a feasible water-assisted thermal regeneration method for high-efficiency regeneration of radon-adsorbed modified activated carbon.

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再生预氧化氮掺杂活性炭的氡吸附性能

氡（Rn）是一种公认的人类致癌物，改性活性炭是除氡最有效的吸附剂之一。饱和氡活性炭的再生是减少二次污染和提高材料利用率的重要手段。本研究对预氧化氮掺杂活性炭（FeN-AC）在400℃含水和干热条件下进行再生，得到T1V-400、T2V-400、D1V-400和D2V-400四种样品。通过测定氡动态吸附系数来评价再生性能。结果表明，经水辅助再生30 min得到的T1V-400的氡吸附量达到鲜en - ac的92.5%，比D1V-400、D2V-400和T2V-400分别提高7.0%、10.0%和21.6%，回收率最高。基于BET和XPS表征分析，吸附氡的回收率受孔隙结构、氮氧含量和比例的共同影响。较高的含氮量、较低的N/O比和较好的微孔结构有利于提高氡的吸附和回收率。动力学分析表明，再生样品的吸附过程以物理吸附和表面吸附为主，与原FeN-AC一致。本研究揭示了孔隙结构和表面化学对氡吸附回收的协同作用，为氡吸附改性活性炭的高效再生提供了一种可行的水辅助热再生方法。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.