Accelerated Photolysis of H2O2 at the Air-Water Interface of a Microdroplet

被引：0

作者：

Rao, Zepeng ^{[1
]}

Fang, Ye-Guang ^{[2
,3
]}

Pan, Yishuai ^{[1
]}

Yu, Wanchao ^{[1
]}

Chen, Baoliang ^{[1
]}

Francisco, Joseph S. ^{[4
]}

Zhu, Chongqin ^{[2
]}

Chu, Chiheng ^{[1
]}

机构：

[1] Department of Environmental Science, Zhejiang University, Hangzhou,310058, China

[2] College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing,100875, China

[3] Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing,100190, China

[4] Department of Earth and Environmental Science and Department of Chemistry, University of Pennsylvania, Philadelphia,PA,19104, United States

来源：

Journal of the American Chemical Society | 2023年

关键词：

Photochemical homolysis of hydrogen peroxide (H2O2) occurs widely in nature and is a key source of hydroxyl radicals (·OH). The kinetics of H2O2 photolysis play a pivotal role in determining the efficiency of ·OH production; which is currently mainly investigated in bulk systems. Here; we report considerably accelerated H2O2 photolysis at the air-water interface of microdroplets; with a rate 1.9 × 103 times faster than that in bulk water. Our simulations show that due to the trans quasiplanar conformational preference of H2O2 at the air-water interface compared to the bulk or gas phase; the absorption peak in the spectrum of H2O2 is significantly redshifted by 45 nm; corresponding to greater absorbance of photons in the sunlight spectrum and faster photolysis of H2O2. This discovery has great potential to solve current problems associated with ·OH-centered heterogeneous photochemical processes in aerosols. For instance; we show that accelerated H2O2 photolysis in microdroplets could lead to markedly enhanced oxidation of SO2 and volatile organic compounds. © 2023 American Chemical Society;

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