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Enhanced Nitrite Production from the Aqueous Photolysis of Nitrate in the Presence of Vanillic Acid and Implications for the Roles of Light-Absorbing Organics
Wang, Yalin1; Huang, Dan Dan2; Huang, Wanyi1; Liu, Ben1; Chen, Qi3; Huang, Rujin4; Gen, Masao5; Mabato, Beatrix Rosette Go6; Chan, Chak K.6; Li, Xue7; Hao, Tianwei1; Tan, Yunkai1; Hoi, Ka In1; Mok, Kai Meng1; Li, Yong Jie1
2021-12-07
Source PublicationEnvironmental Science and Technology
ABS Journal Level3
ISSN0013-936X
Volume55Issue:23Pages:15694-15704
Abstract

A prominent source of hydroxyl radicals (OH), nitrous acid (HONO) plays a key role in tropospheric chemistry. Apart from direct emission, HONO (or its conjugate base nitrite, NO) can be formed secondarily in the atmosphere. Yet, how secondary HONO forms requires elucidation, especially for heterogeneous processes involving numerous organic compounds in atmospheric aerosols. We investigated nitrite production from aqueous photolysis of nitrate for a range of conditions (pH, organic compound, nitrate concentration, and cation). Upon adding small oxygenates such as ethanol,n-butanol, or formate asOH scavengers, the average intrinsic quantum yield of nitrite [Φ(NO)] was 0.75 ± 0.15%. With near-UV-light-absorbing vanillic acid (VA), however, the effective Φ(NO) was strongly pH-dependent, reaching 8.0 ± 2.1% at a pH of 8 and 1.5 ± 0.39% at a more atmospherically relevant pH of 5. Our results suggest that brown carbon (BrC) may greatly enhance the nitrite production from the aqueous nitrate photolysis through photosensitizing reactions, where the triplet excited state of BrC may generate solvated electrons, which reduce nitrate to NOfor further conversion to nitrite. This photosensitization process by BrC chromophores during nitrate photolysis under mildly acidic conditions may partly explain the missing HONO in urban environments.

KeywordAqueous Aerosol Particles Brown Carbon Effective Quantum Yield Hono Formation Nitrate Photolysis Photosensitization
DOI10.1021/acs.est.1c04642
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
WOS IDWOS:000758717600015
Scopus ID2-s2.0-85119951478
Fulltext Access
FWCI1.1136489
Citation statistics
Document TypeJournal article
CollectionDEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING
Faculty of Science and Technology
Corresponding AuthorLi, Yong Jie
Affiliation1.Department of Civil and Environmental Engineering, and Centre for Regional Oceans, Faculty of Science and Technology, University of Macau, 999078, Macao
2.Shanghai Academy of Environmental Sciences, Shanghai, 200233, China
3.State Key Joint Laboratory of Environmental Simulation and Pollution Control, BIC-ESAT and IJRC, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
4.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China
5.Faculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, Kakuma-machi, 920-1192, Japan
6.School of Energy and Environment, City University of Hong Kong, Hong Kong, 999077, Hong Kong
7.Institute of Mass Spectrometry and Atmospheric Environment, Jinan University, Guangzhou, 510632, China
First Author AffilicationFaculty of Science and Technology
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Wang, Yalin,Huang, Dan Dan,Huang, Wanyi,et al. Enhanced Nitrite Production from the Aqueous Photolysis of Nitrate in the Presence of Vanillic Acid and Implications for the Roles of Light-Absorbing Organics[J]. Environmental Science and Technology,2021,55(23):15694-15704.
APA Wang, Yalin,Huang, Dan Dan,Huang, Wanyi,Liu, Ben,Chen, Qi,Huang, Rujin,Gen, Masao,Mabato, Beatrix Rosette Go,Chan, Chak K.,Li, Xue,Hao, Tianwei,Tan, Yunkai,Hoi, Ka In,Mok, Kai Meng,&Li, Yong Jie.(2021).Enhanced Nitrite Production from the Aqueous Photolysis of Nitrate in the Presence of Vanillic Acid and Implications for the Roles of Light-Absorbing Organics.Environmental Science and Technology,55(23),15694-15704.
MLA Wang, Yalin,et al."Enhanced Nitrite Production from the Aqueous Photolysis of Nitrate in the Presence of Vanillic Acid and Implications for the Roles of Light-Absorbing Organics".Environmental Science and Technology 55.23(2021):15694-15704.
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