In this paper, a nanosecond pulsed discharge was employed to modify activated carbon (AC) adsorbents for the purpose of detecting gas-phase polycyclic aromatic hydrocarbons (PAHs). The raw and modified AC were characterized by helium ion microscopy, N2 adsorption/desorption, and X-ray photoelectron spectroscopy. The treatment time, gas composition, and pulse peak voltage of discharge were optimized to improve the adsorption capacity of AC. And the adsorption kinetics of AC was investigated. It is found that the pore structure of AC is changed and the oxygen-containing groups on AC surface are increased after plasma treatment. As a result, the roles of physisorption and chemisorption are promoted, and the adsorption rate of naphthalene is improved by about 10%. More importantly, modified AC adsorbing PAHs obeys Pseudo-first-order model and Langmuir isotherm model, and the corresponding adsorption coefficients are fitted, which contributes to detecting PAHs more accurately. After modified AC enriching, the gas-phase PAHs can be detected with the limit of detections in the range of 20–120 μg/m3.

中文翻译：

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纳秒脉冲放电改性活性炭用于多环芳烃检测

在本文中，为了检测气相多环芳烃 (PAH)，采用纳秒脉冲放电对活性炭 (AC) 吸附剂进行改性。通过氦离子显微镜、N2 吸附/解吸和 X 射线光电子能谱对原始和改性 AC 进行表征。优化处理时间、气体成分和放电脉冲峰值电压，以提高活性炭的吸附能力。并研究了活性炭的吸附动力学。发现等离子处理后活性炭的孔结构发生变化，活性炭表面的含氧基团增加。从而促进了物理吸附和化学吸附的作用，萘的吸附率提高了10%左右。更重要的是，改性AC吸附PAHs遵循伪一级模型和Langmuir等温线模型，并拟合了相应的吸附系数，有助于更准确地检测PAHs。经过改良的 AC 富集，气相多环芳烃可被检出，检出限在 20-120 μg/m3 范围内。