Photoinduced Release of Volatile Organic Compounds from Fatty Alcohols at the Air–Water Interface: The Role of Singlet Oxygen Photosensitized by a Carbonyl Group
- 9 May 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 55 (13), 8683-8690
- https://doi.org/10.1021/acs.est.1c00313
Abstract
Photoinduced interfacial release of volatile organic compounds (VOCs) from surfactants receives emerging concerns. Here, we investigate the photoreaction of 1-nonanol (NOL) as a model surfactant at the air–water interface, especially for the important role of 1O2 in the formation of VOCs. The production of VOCs is real-time quantitated. The results indicate that the oxygen content apparently affects the total yields of VOCs during the photoreaction of interfacial NOL. The photoactivity of NOL is about 8 times higher under air than that under nitrogen, which is mainly attributed to the generation of 1O2. Additionally, the production of VOCs increased by about 4 times with the existence of the air–water interface. Quenching experiments of 1O2 also illustrate the contribution of 1O2 to VOC formation, which could reach more than 95% during photoirradiation of NOL. Furthermore, density functional theory calculations show that 1O2 generated via energy transfer of photosensitizers can abstract two hydrogen atoms from a fatty alcohol molecule. The energy barrier of this reaction is 72.3 kJ/mol, and its reaction rate coefficient is about 2.742 s–1 M–1. 1O2 significantly promotes photoinduced oxidation of fatty alcohols and VOC formation through hydrogen abstraction, which provides a new insight into the interfacial photoreaction.Funding Information
- Youth Innovation Promotion Association of the Chinese Academy of Sciences (2014037)
- National Natural Science Foundation of China (51978643)
- Chinese Academy of Sciences (XDA23010400)
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