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Diesel soot photooxidation enhances the heterogeneous formation of H2SO4

Author

Listed:
  • Peng Zhang

    (Chinese Academy of Sciences)

  • Tianzeng Chen

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Qingxin Ma

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Biwu Chu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Yonghong Wang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yujing Mu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Yunbo Yu

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

  • Hong He

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences
    Chinese Academy of Sciences)

Abstract

Both field observation and experimental simulation have implied that black carbon or soot plays a remarkable role in the catalytic oxidation of SO2 for the formation of atmospheric sulfate. However, the catalytic mechanism remains ambiguous, especially that under light irradiation. Here we systematically investigate the heterogeneous conversion of SO2 on diesel soot or black carbon (DBC) under light irradiation. The experimental results show that the presence of DBC under light irradiation can significantly promote the heterogeneous conversion of SO2 to H2SO4, mainly through the heterogeneous reaction between SO2 and photo-induced OH radicals. The detected photo-chemical behaviors on DBC suggest that OH radical formation is closely related to the abstraction and transfer of electrons in DBC and the formation of reactive superoxide radical (•O2−) as an intermediate. Our results extend the known sources of atmospheric H2SO4 and provide insight into the internal photochemical oxidation mechanism of SO2 on DBC.

Suggested Citation

  • Peng Zhang & Tianzeng Chen & Qingxin Ma & Biwu Chu & Yonghong Wang & Yujing Mu & Yunbo Yu & Hong He, 2022. "Diesel soot photooxidation enhances the heterogeneous formation of H2SO4," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33120-3
    DOI: 10.1038/s41467-022-33120-3
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    References listed on IDEAS

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