期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 27, 期 25, 页码 31289-31299出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-09422-8
关键词
Superoxide anion radical (O-2(center dot-)); 1,4-Benzoquinone (p-BQ); Photochemistry; Laser flash photolysis (LFP); p-BQ anion radical (BQ(center dot-))
资金
- National Natural Science Foundation of China (NSFC) [21876038]
The superoxide anion radical (O-2(center dot-)) is one of the most predominant reactive oxygen species (ROS), which is also involved in diverse chemical and biological processes. In this study, O-2(center dot-) was generated by irradiating riboflavin in an O-2-saturated solution using an ultraviolet lamp (lambda(em) = 365 nm) as the light source. The photochemical reduction of 1,4-benzoquinone (p-BQ) by O-2(center dot-) was explored by 355-nm laser flash photolysis (LFP) and 365-nm UV light steady irradiation. The results showed that the photodecomposition efficiency of p-BQ was influenced by the riboflavin concentration, p-BQ initial concentration, and pH values. The superoxide anion radical originating from riboflavin photolysis served as a reductant to react with p-BQ, forming reduced BQ radicals (BQ(center dot-)) with a second-order rate constant of 1.1 x 10(9) L mol(-1) s(-1). The main product of the photochemical reaction between p-BQ and O-2(center dot-) was hydroquinone (H(2)Q). The present work suggests that the reaction with O-2(center dot-) is a potential transformation pathway of 1, 4-benzoquinone in atmospheric aqueous environments.
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