Scholarlink

<p>Secondary organic aerosol (SOA), as a major component of fine particulate matter (PM<sub>2.5</sub>), significantly impacts air quality, climate, and human health. Although the aqueous chemistry of oxygenated organic compounds (OOCs) is acknowledged as an important contributor to the global SOA budget, the mechanisms by which this process yields SOA-forming oligomers remain unclear. Therefore, we clarify the aqueous-phase reactions of monocarbonyl OOCs (MOOCs, e.g., octanal and 2,4-hexadienal) in sulfuric acid aerosols using quantum chemistry and kinetic calculations. We identified all intermediates and products for established reaction pathways and explored a newly alcohol-governed mechanism for MOOC oligomerization, independent of prior atmospheric knowledge. Oligomers are yielded by the repetition of simple organic reactions, including protonation/deprotonation, hydration/dehydration, and nucleophilic addition, leading to rapid SOA formation. Our results unveil that an alcohol-governed aqueous-phase reaction mechanism of MOOC is likely prevalent across other OOCs in the atmosphere and helps to explain the explosive growth of PM<sub>2.5</sub>.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

An alcohol-governed mechanism of monocarbonyl oligomerization: implications for explosive growth of fine particulate matter

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月2日

查看全文
  • Yuemeng Ji,
  • Jiaxin Wang,
  • Yongpeng Ji,
  • Yanpeng Gao,
  • Weina Zhang,
  • Jiangyao Chen,
  • Guiying Li,
  • Taicheng An

摘要

Secondary organic aerosol (SOA), as a major component of fine particulate matter (PM2.5), significantly impacts air quality, climate, and human health. Although the aqueous chemistry of oxygenated organic compounds (OOCs) is acknowledged as an important contributor to the global SOA budget, the mechanisms by which this process yields SOA-forming oligomers remain unclear. Therefore, we clarify the aqueous-phase reactions of monocarbonyl OOCs (MOOCs, e.g., octanal and 2,4-hexadienal) in sulfuric acid aerosols using quantum chemistry and kinetic calculations. We identified all intermediates and products for established reaction pathways and explored a newly alcohol-governed mechanism for MOOC oligomerization, independent of prior atmospheric knowledge. Oligomers are yielded by the repetition of simple organic reactions, including protonation/deprotonation, hydration/dehydration, and nucleophilic addition, leading to rapid SOA formation. Our results unveil that an alcohol-governed aqueous-phase reaction mechanism of MOOC is likely prevalent across other OOCs in the atmosphere and helps to explain the explosive growth of PM2.5.