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Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution |
Haixia YUAN1,2,Huxiang PAN2,Jin SHI1,Hongjing LI1,*(),Wenbo DONG1,*() |
1. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China 2. Institutes of Naval Medicine, Shanghai 200433, China |
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Abstract The reactions between chlorinated benzenes (CBzs) and hydrated electron (eaq-) 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 eaq- 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 eaq- 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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Keywords
chlorinated benzenes
hydrated electron
electron beam
laser flash photolysis
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Corresponding Author(s):
Hongjing LI,Wenbo DONG
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Online First Date: 10 April 2014
Issue Date: 25 June 2015
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