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首页> 外文期刊>Environmental Science & Technology >Reactive Oxygen Species-Related Inside-to-Outside Oxidation of Soot Particles Triggered by Visible-Light Irradiation: Physicochemical Property Changes and Oxidative Potential Enhancement
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Reactive Oxygen Species-Related Inside-to-Outside Oxidation of Soot Particles Triggered by Visible-Light Irradiation: Physicochemical Property Changes and Oxidative Potential Enhancement

机译：由可见光照射引发的烟灰颗粒的反应性氧物种相关内外氧化：物理化学性能变化和氧化潜在增强

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摘要

Modifications of the physicochemical properties and oxidative potential (OP) of soot due to visible-light irradiation and its underlying mechanisms during atmospheric aging have not been elucidated. In this study, two types of soot obtained using different air/fuel ratios (A/F) were aged under visible light with or without ozone (O_3) at an atmospherically relevant level in an environmental chamber. Physicochemical characteristics and OP of aged soot were systematically measured using the dithiothreitol (DTT) assay (OP~(DTT)). Regardless of the presence of O_3, visible light markedly promoted oxidation of soot, which led to consumption of polycyclic aromatic hydrocarbons, formation of oxygen-containing functional groups, and enhancement of OP~(DTT) values. Compared to low-A/F soot, high-A/F soot contained more elemental carbon but less organic carbon and was more sensitive to visible light by exhibiting greater changes. It was proposed that elemental carbon in soot under visible-light irradiation initiated an inside-to-outside oxidation pathway, where reactive oxygen species played an important role. This study clarified the solar irradiation-triggered self-oxidation process in soot, which is important to its atmospheric and health effects.
机译：尚未阐明由于可见光照射引起的烟灰的理化性质和氧化势（OP）的修饰，并未阐明其在大气老化期间的潜在机制。在该研究中，使用不同的空气/燃料比（A / F）获得的两种类型的烟灰在有或没有臭氧（O_3）的可见光下在环境室中的大气相关水平下老化。使用二硫代噻唑醇（DTT）测定（OP〜（DTT））系统地测量物理化学特性和老年烟灰。无论O_3的存在如何，可见光明显促进烟灰的氧化，从而导致多环芳烃的消耗，形成含氧官能团，并提高OP〜（DTT）值。与低a / f烟灰相比，高a / f烟灰包含更多元素的碳，但通过表现出更大的变化，对可见光更敏感。提出了在可见光照射下烟灰中的元素碳引发了内外氧化途径，反应性氧物种起着重要作用。本研究阐明了烟灰中的太阳照射触发的自氧化过程，对其大气和健康效应重要。

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  • 来源
    《Environmental Science & Technology》 |2020年第14期|8558-8567|共10页
  • 作者

    Jiali Zhu; Jing Shang; Yueyue Chen; Yu Kuang; Tong Zhu;

  • 作者单位

    State Key joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 P. R. China;

    State Key joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 P. R. China;

    State Key joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 P. R. China;

    State Key joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 P. R. China;

    State Key joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering and Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT) Peking University Beijing 100871 P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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