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

Guangzhi He; Jinzhu Ma; Biwu Chu; Renzhi Hu; Hao Li; Meng Gao; Yuan Liu; Yonghong Wang; Qingxin Ma; Pinhua Xie; Guoxian Zhang; Xiao Cheng Zeng; Joseph S. Francisco; Hong He

doi:10.1002/anie.202201638

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

Guangzhi He, Jinzhu Ma, Biwu Chu, Renzhi Hu, Hao Li, Meng Gao, Yuan Liu, Yonghong Wang, Qingxin Ma, Pinhua Xie, Guoxian Zhang, Xiao Cheng Zeng^*, Joseph S. Francisco^*, Hong He^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

53 Citations (Scopus)

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.

Original language	English
Article number	e202201638
Journal	Angewandte Chemie - International Edition
Volume	61
Issue number	21
Online published	11 Mar 2022
DOIs	https://doi.org/10.1002/anie.202201638
Publication status	Published - 16 May 2022
Externally published	Yes

Research Keywords

Carbonaceous Surface
OH Radicals
Soot
Surface Hydroxyls

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Cite this

@article{f7a80b1cf4c64c688c85ded0e0a6014d,

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.",

keywords = "Carbonaceous Surface, OH Radicals, Soot, Surface Hydroxyls",

author = "Guangzhi He and Jinzhu Ma and Biwu Chu and Renzhi Hu and Hao Li and Meng Gao and Yuan Liu and Yonghong Wang and Qingxin Ma and Pinhua Xie and Guoxian Zhang and Zeng, {Xiao Cheng} and Francisco, {Joseph S.} and Hong He",

year = "2022",

month = may,

day = "16",

doi = "10.1002/anie.202201638",

language = "English",

volume = "61",

journal = "Angewandte Chemie - International Edition",

issn = "1433-7851",

publisher = "John Wiley & Sons",

number = "21",

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TY - JOUR

T1 - Generation and Release of OH Radicals from the Reaction of H2O with O2 over Soot

AU - He, Guangzhi

AU - Ma, Jinzhu

AU - Chu, Biwu

AU - Hu, Renzhi

AU - Li, Hao

AU - Gao, Meng

AU - Liu, Yuan

AU - Wang, Yonghong

AU - Ma, Qingxin

AU - Xie, Pinhua

AU - Zhang, Guoxian

AU - Zeng, Xiao Cheng

AU - Francisco, Joseph S.

AU - He, Hong

PY - 2022/5/16

Y1 - 2022/5/16

N2 - 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.

AB - 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.

KW - Carbonaceous Surface

KW - OH Radicals

KW - Soot

KW - Surface Hydroxyls

UR - http://www.scopus.com/inward/record.url?scp=85127119316&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85127119316&origin=recordpage

U2 - 10.1002/anie.202201638

DO - 10.1002/anie.202201638

M3 - RGC 21 - Publication in refereed journal

SN - 1433-7851

VL - 61

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

IS - 21

M1 - e202201638

ER -