中文版 | English
Title

Accurate identification of radicals by in-situ electron paramagnetic resonance in ultraviolet-based homogenous advanced oxidation processes

Author
Corresponding AuthorLiu,Wen
Publication Years
2022-08-01
DOI
Source Title
ISSN
0043-1354
EISSN
1879-2448
Volume221
Abstract
Accurate identification of radicals in advanced oxidation processes (AOPs) is important to study the mechanisms on radical production and subsequent oxidation-reduction reaction. The commonly applied radical quenching experiments cannot provide direct evidences on generation and evolution of radicals in AOPs, while electron paramagnetic resonance (EPR) is a cutting-edge technology to identify radicals based on spectral characteristics. However, the complexity of EPR spectrum brings uncertainty and inconsistency to radical identification and mechanism clarification. This work presented a comprehensive study on identification of radicals by in-situ EPR analysis in four typical UV-based homogenous AOPs, including UV/HO, UV/peroxodisulfate (and peroxymonosulfate), UV/peracetic acid and UV/IO systems. Radical formation mechanism was also clarified based on EPR results. A reliable EPR method using organic solvents was proposed to identify alkoxy and alkyl radicals (CHC(=O)OO·, CHC(=O)O· and ·CH) in UV/PAA system. Two activation pathways for radical production were proposed in UV/IO system, in which the produced IO·, IO·, ·OH and hydrated electron were precisely detected. It is interesting that addition of specific organic solvents can effectively identify oxygen-center and carbon-center radicals. A key parameter in EPR spectrum for 5,5-dimethyl-1-pyrroline N-oxide (DMPO) spin adduct, A, is ranked as: ·CH (23 G) >·OH (15 G) >IO· (12.9 G) >O· (11 G) ≥·OOH (9–11 G) ≥IO· (9–10 G) ≥SO· (9–10 G) >CHC(=O)OO· (8.5 G) > CHC(=O)O· (7.5 G). This study will give a systematic method on identification of radicals in AOPs, and shed light on the insightful understanding of radical production mechanism.
Keywords
URL[Source Record]
Indexed By
SCI ; EI
Language
English
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SUSTech Authorship
Others
Funding Project
China Postdoctoral Science Foundation[2021M690208];China Postdoctoral Science Foundation[2021M700213];National Key Research and Development Program of China Stem Cell and Translational Research[2021YFA1202500];National Natural Science Foundation of China[21906001];National Natural Science Foundation of China[51721006];Beijing Nova Program[Z191100001119054];
WOS Research Area
Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS Subject
Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS Accession No
WOS:000835552300003
Publisher
EI Accession Number
20222612277445
EI Keywords
Electron resonance ; Electron spin resonance spectroscopy ; Electrons ; Organic solvents ; Oxidation ; Paramagnetism ; Redox reactions
ESI Classification Code
Magnetism: Basic Concepts and Phenomena:701.2 ; Chemistry:801 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Organic Compounds:804.1
ESI Research Field
ENVIRONMENT/ECOLOGY
Scopus EID
2-s2.0-85132722867
Data Source
Scopus
Citation statistics
Cited Times [WOS]:51
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/352481
DepartmentSchool of Environmental Science and Engineering
Affiliation
1.The Key Laboratory of Water and Sediment Sciences,Ministry of Education,College of Environmental Sciences and Engineering,Peking University,Beijing,100871,China
2.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Department of Civil and Environmental Engineering,Louisiana State University,Baton Rouge,70803,United States
4.State Key Laboratory of Hydraulics and Mountain River Engineering,College of Architecture and Environment,Sichuan University,Chengdu,610065,China
Recommended Citation
GB/T 7714
Chen,Long,Duan,Jun,Du,Penghui,et al. Accurate identification of radicals by in-situ electron paramagnetic resonance in ultraviolet-based homogenous advanced oxidation processes[J]. WATER RESEARCH,2022,221.
APA
Chen,Long,Duan,Jun,Du,Penghui,Sun,Weiliang,Lai,Bo,&Liu,Wen.(2022).Accurate identification of radicals by in-situ electron paramagnetic resonance in ultraviolet-based homogenous advanced oxidation processes.WATER RESEARCH,221.
MLA
Chen,Long,et al."Accurate identification of radicals by in-situ electron paramagnetic resonance in ultraviolet-based homogenous advanced oxidation processes".WATER RESEARCH 221(2022).
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