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Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution

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Abstract

The reactions between chlorinated benzenes (CBzs) and hydrated electron (e −aq ) were investigated by the electron beam (EB) and laser flash photolysis (LFP) experiments. Under the EB irradiation, the effects of irradiation dose, initial concentration and the number of Cl atoms on the removal efficiencies were further examined. At 10 kGy, the removal efficiencies of mono-CB, 1,3-diCB, 1,2-diCB and 1,4-diCB were 41.2%, 87.2%, 84.0%, and 84.1%, respectively. While irradiation dose was 50 kGy, the removal efficiencies increased to 47.4%, 95.8%, 95.0%, and 95.2%, respectively. Irradiation of CBzs solutions has shown that the higher the initial concentration, the lower the percentage of CBzs removal. In addition to this, the dechlorination efficiencies of 1,2-dichlorobenzene (1,2-diCB), 1,3-dichlorobenzene (1,3-diCB) and 1,4-dichlorobenzene (1,4-diCB) were much higher than that of chlorobenzene (mono-CB). The kinetics of the reactions was achieved with nanosecond LFP. The rate constants of second-order reaction between e −aq with mono-CB, 1,2-diCB, 1,3-diCB and 1,4-diCB were (5.3±0.4) × 108, (4.76±0.1) × 109, (1.01±0.1) × 1010 and (3.29±0.2) × 109 L·mol−1·s−1, respectively. Density functional theory (DFT) calculations were performed to determine the optical properties of unstable CBzs anion radicals, and the main absorption peaks lied in the range of 300–550 nm. The primary reaction pathway of CBzs with e −aq was gradual dechlorination, and the major products were Cl− and benzene (CBzs(-Cl−)). Furthermore, biphenyl (or chlorobiphenyl) was observed during the LFP, which was probably formed by recombination of benzene radicals.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai, 200433, China

    Haixia Yuan, ** Shi, Hong**g Li & Wenbo Dong

  2. Institutes of Naval Medicine, Shanghai, 200433, China

    Haixia Yuan & Huxiang Pan

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  1. Haixia Yuan
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  2. Huxiang Pan
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  3. ** Shi
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  4. Hong**g Li
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Correspondence to Hong**g Li or Wenbo Dong.

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Yuan, H., Pan, H., Shi, J. et al. Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution. Front. Environ. Sci. Eng. 9, 583–590 (2015). https://doi.org/10.1007/s11783-014-0691-8

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