共 57 条
Photochemical reactions between 1,4-benzoquinone and O2•-
被引:79
作者:
Zhu, Mengyu
[1
,2
]
Lu, Jun
[3
]
Hu, Yadong
[1
,2
]
Liu, Ying
[1
,2
]
Hu, Shuheng
[1
,4
]
Zhu, Chengzhu
[1
,2
,4
]
机构:
[1] Hefei Univ Technol, Sch Resource & Environm Engn, Hefei 230009, Peoples R China
[2] Hefei Univ Technol, Inst Atmospher Environm & Pollut Control, Hefei 230009, Peoples R China
[3] Hefei Univ Technol, Ctr Anal & Measurement, Hefei 230009, Peoples R China
[4] Hefei Univ Technol, Key Lab Nanominerals & Pollut Control Anhui Highe, Hefei 230009, Peoples R China
基金:
中国国家自然科学基金;
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-));
SUPEROXIDE-DISMUTASE;
ELECTRON-TRANSFER;
PULSE-RADIOLYSIS;
SINGLET OXYGEN;
OXIDATION;
RIBOFLAVIN;
BENZOQUINONE;
OZONE;
LIGHT;
AIR;
D O I:
10.1007/s11356-020-09422-8
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
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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页码:31289 / 31299
页数:11
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