期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 107, 期 15, 页码 6605-6609出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0908341107
关键词
HONO; nitrogen oxides; photochemistry; aerosol; heterogeneous chemistry
资金
- Agence de l'Environnement et de la Maitrise de l'Energie
- Cluster Chimie Region Rhone Alpes
- National Sciences and Engineering Research Council
- European Science Foundation
- Swiss National Science Foundation
Soot particles produced by incomplete combustion processes are one of the major components of urban air pollution. Chemistry at their surfaces lead to the heterogeneous conversion of several key trace gases; for example NO2 interacts with soot and is converted into HONO, which rapidly photodissociates to form OH in the troposphere. In the dark, soot surfaces are rapidly deactivated under atmospheric conditions, leading to the current understanding that soot chemistry affects tropospheric chemical composition only in a minor way. We demonstrate here that the conversion of NO2 to HONO on soot particles is drastically enhanced in the presence of artificial solar radiation, and leads to persistent reactivity over long periods. Soot photochemistry may therefore be a key player in urban air pollution.
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