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<p>Mineral aerosols, a component of ambient particles, play a crucial role in heterogeneous reactions with pollutant gases in the atmosphere. While numerous studies have investigated the reactions of individual gaseous pollutants on mineral surfaces, research on processes involving complex pollutants remains limited. In this work, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was employed to explore the behaviors of toluene and nitrogen dioxide (NO₂) during their heterogeneous interactions with standard clay mineral particle chlorite, as well as dust particles collected from the center (Tazhong, TZ) and northern border (Xiaotang, XT) of the Taklimakan Desert. Our data showed that, regardless of light or dark conditions, the total production of NO₂ and toluene in heterogeneous reactions on the particles followed the order: XT dust samples &gt; chlorite particles &gt; TZ dust samples. However, nitrate production ranked as XT dust samples &gt; TZ dust samples &gt; chlorite at 298&#xa0;K, and XT dust samples &gt; chlorite &gt; TZ dust samples at 343&#xa0;K, suggesting that temperature exerts a greater influence on the reactions compared to light conditions. The electron spin resonance (ESR) and dithiothreitol assay (DTT) results indicated that the oxidizing capacity of the samples followed the order XT &gt; TZ &gt; chlorite, suggesting that certain heavy metals, such as iron, might act as catalysts for the higher nitrate production in the heterogeneous reactions. Additionally, these heterogeneous reactions could produce HONO, which plays a key role in atmospheric oxidizing capacity, triggering the oxidation of many atmospheric species and promoting the formation of secondary products, including ozone.</p>

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Comparison of the Heterogeneous Reactions of Nitrogen Dioxide and Toluene on the Surface of Clay Mineral and Dust Particles

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Senlin Lu,
  • Jiumei Zhao,
  • Jiakuan Lu,
  • Guoqing Hou,
  • Jingying Niuhe,
  • Xinchun Liu,
  • Wei Zhang,
  • Yonemochi Shinichi,
  • Christian Ebere Enyoh,
  • Qingyue Wang,
  • Weiqian Wang

摘要

Mineral aerosols, a component of ambient particles, play a crucial role in heterogeneous reactions with pollutant gases in the atmosphere. While numerous studies have investigated the reactions of individual gaseous pollutants on mineral surfaces, research on processes involving complex pollutants remains limited. In this work, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was employed to explore the behaviors of toluene and nitrogen dioxide (NO₂) during their heterogeneous interactions with standard clay mineral particle chlorite, as well as dust particles collected from the center (Tazhong, TZ) and northern border (Xiaotang, XT) of the Taklimakan Desert. Our data showed that, regardless of light or dark conditions, the total production of NO₂ and toluene in heterogeneous reactions on the particles followed the order: XT dust samples > chlorite particles > TZ dust samples. However, nitrate production ranked as XT dust samples > TZ dust samples > chlorite at 298 K, and XT dust samples > chlorite > TZ dust samples at 343 K, suggesting that temperature exerts a greater influence on the reactions compared to light conditions. The electron spin resonance (ESR) and dithiothreitol assay (DTT) results indicated that the oxidizing capacity of the samples followed the order XT > TZ > chlorite, suggesting that certain heavy metals, such as iron, might act as catalysts for the higher nitrate production in the heterogeneous reactions. Additionally, these heterogeneous reactions could produce HONO, which plays a key role in atmospheric oxidizing capacity, triggering the oxidation of many atmospheric species and promoting the formation of secondary products, including ozone.