Zixuan Wang, Zhaolian Ye, Dandan Hu, Hui Wang, Xinlei Ge
{"title":"254 nm/313 nm辐照下丁香酚和乙丁香酮水相氧化动力学及产物特性研究","authors":"Zixuan Wang, Zhaolian Ye, Dandan Hu, Hui Wang, Xinlei Ge","doi":"10.1007/s11869-025-01717-4","DOIUrl":null,"url":null,"abstract":"<div><p>Phenolic compounds emitted from biomass burning are important precursors for the formation of aqueous secondary organic aerosols (aqSOA), but there is limited research on the formation mechanisms, product characteristics, and related kinetics, especially on comparative studies under different wavelengths of ultraviolet (UV) light. Therefore, this study selected eugenol (Eug) and acetosyringone (AS) as precursors to investigate the kinetics of aqueous-phase oxidation reactions under two UV light sources (254 nm/313 nm). The results showed that the pseudo-first-order rate constant, <i>k</i><sub>obs</sub> was highly dependent on pH value, initial phenolic compounds concentration and added H<sub>2</sub>O<sub>2</sub> dosages. The ranking of <i>k</i><sub>obs</sub> were <i>k</i><sub>O2</sub> > <i>k</i><sub>air</sub> > <i>k</i><sub>N2</sub>, indicating that oxygen is beneficial for degradation. Scavenging experiments determined the relative contributions of reactive oxygen species (ROS) and the results showed that both •OH and O<sub>2</sub><sup>•−</sup> played significant roles in the photodecay of Eug and AS, with O<sub>2</sub><sup>•−</sup> being more prominent. Light-absorbance at 365 nm of products increased for the first 7 h, and then decreased at the later stage indicated the formation of light-absorbing substances and subsequent photobleaching. Combining the changes in organic acids, oxidative characteristics, and product composition during the reaction, it is speculated that the products of the OH aqueous-phase oxidation of the two phenolic compounds undergo functionalization followed by fragmentation, leading to an increase in oxidation degree. Organic acids are formed through dehydrogenation or ring-opening, further impacting climate change and air quality. This study for the first time compared the reaction rates of the two phenols under 313 nm UV light source and comprehensively analyze the products characteristics and mechanisms, which was significant for expanding the atmospheric kinetics database and understanding the chemical activity of phenolic substances in the atmosphere.</p></div>","PeriodicalId":49109,"journal":{"name":"Air Quality Atmosphere and Health","volume":"18 5","pages":"1407 - 1424"},"PeriodicalIF":2.9000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study on the kinetics and product characteristics of aqueous-phase oxidation of Eugenol and acetosyringone upon 254 nm/313 nm irradiation\",\"authors\":\"Zixuan Wang, Zhaolian Ye, Dandan Hu, Hui Wang, Xinlei Ge\",\"doi\":\"10.1007/s11869-025-01717-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Phenolic compounds emitted from biomass burning are important precursors for the formation of aqueous secondary organic aerosols (aqSOA), but there is limited research on the formation mechanisms, product characteristics, and related kinetics, especially on comparative studies under different wavelengths of ultraviolet (UV) light. Therefore, this study selected eugenol (Eug) and acetosyringone (AS) as precursors to investigate the kinetics of aqueous-phase oxidation reactions under two UV light sources (254 nm/313 nm). The results showed that the pseudo-first-order rate constant, <i>k</i><sub>obs</sub> was highly dependent on pH value, initial phenolic compounds concentration and added H<sub>2</sub>O<sub>2</sub> dosages. The ranking of <i>k</i><sub>obs</sub> were <i>k</i><sub>O2</sub> > <i>k</i><sub>air</sub> > <i>k</i><sub>N2</sub>, indicating that oxygen is beneficial for degradation. Scavenging experiments determined the relative contributions of reactive oxygen species (ROS) and the results showed that both •OH and O<sub>2</sub><sup>•−</sup> played significant roles in the photodecay of Eug and AS, with O<sub>2</sub><sup>•−</sup> being more prominent. Light-absorbance at 365 nm of products increased for the first 7 h, and then decreased at the later stage indicated the formation of light-absorbing substances and subsequent photobleaching. Combining the changes in organic acids, oxidative characteristics, and product composition during the reaction, it is speculated that the products of the OH aqueous-phase oxidation of the two phenolic compounds undergo functionalization followed by fragmentation, leading to an increase in oxidation degree. Organic acids are formed through dehydrogenation or ring-opening, further impacting climate change and air quality. This study for the first time compared the reaction rates of the two phenols under 313 nm UV light source and comprehensively analyze the products characteristics and mechanisms, which was significant for expanding the atmospheric kinetics database and understanding the chemical activity of phenolic substances in the atmosphere.</p></div>\",\"PeriodicalId\":49109,\"journal\":{\"name\":\"Air Quality Atmosphere and Health\",\"volume\":\"18 5\",\"pages\":\"1407 - 1424\"},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2025-03-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Air Quality Atmosphere and Health\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11869-025-01717-4\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Air Quality Atmosphere and Health","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s11869-025-01717-4","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Study on the kinetics and product characteristics of aqueous-phase oxidation of Eugenol and acetosyringone upon 254 nm/313 nm irradiation
Phenolic compounds emitted from biomass burning are important precursors for the formation of aqueous secondary organic aerosols (aqSOA), but there is limited research on the formation mechanisms, product characteristics, and related kinetics, especially on comparative studies under different wavelengths of ultraviolet (UV) light. Therefore, this study selected eugenol (Eug) and acetosyringone (AS) as precursors to investigate the kinetics of aqueous-phase oxidation reactions under two UV light sources (254 nm/313 nm). The results showed that the pseudo-first-order rate constant, kobs was highly dependent on pH value, initial phenolic compounds concentration and added H2O2 dosages. The ranking of kobs were kO2 > kair > kN2, indicating that oxygen is beneficial for degradation. Scavenging experiments determined the relative contributions of reactive oxygen species (ROS) and the results showed that both •OH and O2•− played significant roles in the photodecay of Eug and AS, with O2•− being more prominent. Light-absorbance at 365 nm of products increased for the first 7 h, and then decreased at the later stage indicated the formation of light-absorbing substances and subsequent photobleaching. Combining the changes in organic acids, oxidative characteristics, and product composition during the reaction, it is speculated that the products of the OH aqueous-phase oxidation of the two phenolic compounds undergo functionalization followed by fragmentation, leading to an increase in oxidation degree. Organic acids are formed through dehydrogenation or ring-opening, further impacting climate change and air quality. This study for the first time compared the reaction rates of the two phenols under 313 nm UV light source and comprehensively analyze the products characteristics and mechanisms, which was significant for expanding the atmospheric kinetics database and understanding the chemical activity of phenolic substances in the atmosphere.
期刊介绍：
Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health.
It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes.
International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals.
Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements.
This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.
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