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Angew. Chem. - 中国科学院生态环境研究中心贺泓院士,美国内布拉斯加大学林肯分校的曾晓成教授,美国宾夕法尼亚大学Joseph S. Francisco教授

发布时间: 2022-5-13 来源: WILEY-VCH

Title: Generation and Release of OH Radicals from the Reaction of H2O with O2 over Soot

Abstract: OH radicals in the air maintain the oxidizing power of the troposphere. A conventional view is that particulate matter (PM) in the atmosphere is a major sink of OH radicals, thereby lowering the oxidizing power of atmosphere in the event of high-level PM. By contrary, our joint experimental/theoretical study reveals a new mechanism for the generation of gaseous OH radicals by carbonaceous soot particles. We show that water and O2 react on carbonaceous surfaces and give rise to gaseous OH radicals under irradiation. With ample delocalized π electrons, carbonaceous surfaces enable the easy desorption of hydroxyl groups to produce gaseous OH radicals, evidenced by direct observation of the steady generation of OH radicals on a carbonaceous surface. Our results reveal a new chemical mechanism for the production of OH radicals.

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