Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (04): 367-371.doi: 10.3866/PKU.WHXB20050405

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

ZHU Cheng-Zhu; ZHAGN Ren-Xi; FANG Hao-Jie; ZHAO Qing-Xiang; HOU Hui-Qi   

  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:2004-08-17 Revised:2004-11-08 Published:2005-04-15
  • Contact: HOU Hui-Qi E-mail:fdesi@fudan.edu.cn

Abstract: 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.

Key words: Laser flash photolysis, Chlorobenzene, Nitrous acid, Transient absorption spectra, •, OH radical