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Citation: ZHU Cheng-Zhu, ZHAGN Ren-Xi, FANG Hao-Jie, ZHAO Qing-Xiang, HOU Hui-Qi. Study on the Reaction Mechanism of Chlorobenzene with Nitrous Acid in Atmospheric Aqueous Phases Initiated by Irradiation of 355 nm UV Light[J]. Acta Physico-Chimica Sinica, ;2005, 21(04): 367-371. doi: 10.3866/PKU.WHXB20050405 shu

Study on the Reaction Mechanism of Chlorobenzene with Nitrous Acid in Atmospheric Aqueous Phases Initiated by Irradiation of 355 nm UV Light

1.
Institute of Environmental Science, Fudan University, Shanghai 200433； College of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237

Received Date: 17 August 2004
Available Online: 15 April 2005

The reaction microscopic mechanism of aqueous solution of chlorobenzene with nitrous acid in the presence of O₂ and absence of O₂ was studied by laser flash photolysis. The main characteristic peaks in these transient absorbance spectra were attributed and the build-up/decay trends of several transient species were investigated. •OH radical can be produced in aqueous solution of nitrous acid exposed to 355 nm laser beam. The rate constant of the reaction between •OH radical and chlorobenzene was measured to be （6. 6～7. 0）×10⁹ L•mol^-1•s^-1. The transient product C6H5Cl-OH reacted with O₂ to form C6H5Cl-OHO₂ with a rate constant of (1. 6±0. 2) ×10⁹ L•mol^-1•s^-1. The photolysis products were analyzed by GC/MS method and the possible reaction pathways were discussed.
- Laser flash photolysis; Chlorobenzene; Nitrous acid; Transient absorption spectra; •OH radical
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