Continuous cryogenic adsorption adjustments of radon in air using carbon-based microporous adsorbents

IF 2.6 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Technology Pub Date : 2025-06-12 DOI:10.1016/j.net.2025.103704

Xu Feng , HuiJia Long , Chengtao Yue , ShouKang Qiu , Quan Tang , LongCheng Liu

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引用次数: 0

Abstract

In underground low-background laboratories (LRBL), minimizing radon concentration is crucial. This study developed a cryogenic Rn adsorption system, which operated for more than 5 h at a flow rate of 60 L/min. The dynamic adsorption coefficients (

K_{d}

) of Rn on four carbon-based adsorbents were measured at 293 K, 243 K and 223 K. Combined with the results of N₂-adsorption and desorption,XPS, FTIR and SEM test results indicated that the larger the micropore volume within the 0.5–0.7 nm range, the higher the the

K_{d}

of Rn adsorption of the adsorbent, and this difference becomes more obvious with the decrease of adsorption temperature. CarbosieveS-III exhibited the highest

K_{d}

at 223 K (436 L/g). Adsorption penetration curves of each component of Rn-containing air on activated carbon were measured using an infrared gas analyzer and a RAD7 radon meter. The CO₂ concentration gradient was adjusted, and the

K_{d}

of all adsorbents (including reduced carbon molecular sieves) were measured. Experimental results revealed that CO₂ acts as the dominant competitive adsorbate for radon capture when water vapor interference was eliminated.

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碳基微孔吸附剂对空气中氡的连续低温吸附调节

在地下低本底实验室（LRBL）中，降低氡浓度至关重要。本研究开发了一种低温吸附系统，该系统在60 L/min的流速下运行5 h以上。测定了4种碳基吸附剂在293 K、243 K和223 K下对Rn的动态吸附系数Kd。结合n2吸附和解吸结果，XPS、FTIR和SEM测试结果表明，在0.5 ~ 0.7 nm范围内，微孔体积越大，吸附剂对Rn的吸附Kd越高，并且随着吸附温度的降低，这种差异变得更加明显。CarbosieveS-III在223 K （436 L/g）时Kd值最高。采用红外气体分析仪和RAD7型氡计测定了含氡空气中各组分在活性炭上的吸附渗透曲线。调整CO2浓度梯度，测定各吸附剂（包括还原碳分子筛）的Kd值。实验结果表明，在排除水蒸气干扰的情况下，CO2是氡捕获的主要竞争吸附质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Engineering and Technology 工程技术-核科学技术

CiteScore

4.80

自引率

7.40%

发文量

431

审稿时长

3.5 months

期刊介绍： Nuclear Engineering and Technology (NET), an international journal of the Korean Nuclear Society (KNS), publishes peer-reviewed papers on original research, ideas and developments in all areas of the field of nuclear science and technology. NET bimonthly publishes original articles, reviews, and technical notes. The journal is listed in the Science Citation Index Expanded (SCIE) of Thomson Reuters. NET covers all fields for peaceful utilization of nuclear energy and radiation as follows: 1) Reactor Physics 2) Thermal Hydraulics 3) Nuclear Safety 4) Nuclear I&C 5) Nuclear Physics, Fusion, and Laser Technology 6) Nuclear Fuel Cycle and Radioactive Waste Management 7) Nuclear Fuel and Reactor Materials 8) Radiation Application 9) Radiation Protection 10) Nuclear Structural Analysis and Plant Management & Maintenance 11) Nuclear Policy, Economics, and Human Resource Development