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Mechanism and kinetics of 2-chlorophenol decomposition using coupled ultrasound and electrocatalysis

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Abstract

A coupled ultrasound/electrocatalysis (US/EC) process was used to enhance the decomposition efficiency of organics. The synergetic kinetics and the mechanism of 2-chlorophenol (2-CP) decomposition with coupled US/EC were studied. It was found that in a US/EC process 2-CP is attacked by active radicals (such as hydroxyl radicals) to form 2-chloro-p-benzoquinone, and the latter is oxidized to simple organic acids when the ring is opened. The enhancement factor expressed by the apparent rate constant of 2-CP decomposition with coupled US/EC is 1.324 at a current density of 20 mA · cm−2, an ultrasonic frequency of 20 kHz, an ultrasonic intensity of 0.27 W · cm−2, and a 2-CP initial concentration of 200 mg · L−1, which means that a synergetic effect exists. A model derived from Langmuir adsorption theory of solid surface and reaction kinetics equations can describe exactly the decomposition of 2-CP with coupled US/EC. The numerical values are in good agreement with the experimental data. The model parameters are associated with reaction conditions.

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Authors and Affiliations

  1. Environmental Engineering Research Center, Zhejiang University of Technology, Hangzhou, 310032, China

    JiaDe Wang, RunYe Zhu, Xia Chen & JianMeng Chen

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  1. JiaDe Wang
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  2. RunYe Zhu
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  3. Xia Chen
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  4. JianMeng Chen
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Correspondence to JianMeng Chen.

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Supported by Science and Technology Department of Zhejiang Province (Grant No. 2005C23056)

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Wang, J., Zhu, R., Chen, X. et al. Mechanism and kinetics of 2-chlorophenol decomposition using coupled ultrasound and electrocatalysis. Sci. China Ser. B-Chem. 51, 577–585 (2008). https://doi.org/10.1007/s11426-007-0137-2

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  • DOI: https://doi.org/10.1007/s11426-007-0137-2

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