Photoinduced formation of persistent free radicals, hydrogen radicals, and hydroxyl radicals from catechol on atmospheric particulate matter

被引：32
|
作者：
Qin, Linjun [1 ,2 ]
Yang, Lili [1 ,2 ]
Yang, Jiahui [3 ]
Weber, Ralph [4 ]
Ranguelova, Kalina [4 ]
Liu, Xiaoyun [1 ,2 ]
Lin, Bingcheng [5 ]
Li, Cui [1 ,2 ]
Zheng, Minghui [1 ,2 ,5 ]
Liu, Guorui [1 ,2 ,5 ]
机构：
[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China
[2] Univ Chinese Acad Sci, Coll Resource & Environm, Beijing 100049, Peoples R China
[3] Bruker BioSpin Corp, Shanghai 200233, Peoples R China
[4] Bruker BioSpin Corp, Billerica, MA 01821 USA
[5] UCAS, Hangzhou Inst Adv Study, Sch Environm, Hangzhou 310000, Peoples R China
来源：
ISCIENCE | 2021年 / 24卷 / 03期
基金：
中国国家自然科学基金;
关键词：
ELECTRON-PARAMAGNETIC-RESONANCE; HIGH-TEMPERATURE PYROLYSIS; PHENOXY RADICALS; DIOXIN FORMATION; P-DIOXINS; GENERATION; XPS; SPECTROSCOPY; MECHANISMS; MODEL;
D O I：
10.1016/j.isci.2021.102193
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Catechol is speculated to be a potential precursor of environmentally persistent free radicals (EPFRs) in the atmosphere. EPFRs absorbed on PM2.5 have attracted public attention because their toxicity is similar to cigarette smoke. In this study, we found that catechol could produce EPFRs, which were oxygen-centered phenoxy and semiquinone radicals. These free radical species had half-lives of up to 382 days. CaO, CuO, and Fe2O3 markedly promoted EPFR formation from catechol. The valence states of Cu and Fe changed during the photochemical reactions of catechol but no valence state changed for Ca. Alkaline nature of CaO is possibly the key for promoting the free radical formations through acid-base reactions with catechol. In addition to hydroxyl free radicals, hydrogen free radicals and superoxide anions formed from the photochemical reactions of catechol were first discovered. This is of concern because of the adverse effects of these free radicals on human health.
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页数：24
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