Chlorobenzene degradation by electro-heterogeneous catalysis in aqueous
solution: intermediates and reaction mechanism |
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Authors: | WANG Jiade MEI Yu LIU Chenliang and CHEN Jianmeng |
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Institution: | College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China. |
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Abstract: | This study was performed to investigate the variables that influence chlorobenzene (CB) degradation in aqueous solution by electro-heterogeneous catalysis. The effects of current density, pH, and electrolyte concentration on CB degradation were determined. The degradation efficiency of CB was almost 100% with an initial CB concentration of 50 mg/L, current density 15 mA/cm2, initial pH 10, electrolyte concentration 0.1 mol/L, and temperature 25℃ after 90 min of reaction. Under the same conditions, the degradation efficiency of CB was only 51% by electrochemical (EC) process, which showed that electro-heterogeneous catalysis was more efficient than EC alone. The analysis results of Purge-and-Trap chromatography-mass spectrometry (P&T/GC/MS) and ion chromatography the release of Cl-. Further oxidation of phenol and biphenyl produced p-Vinylbenzoic acid and hydroquinol. Finally, the compounds were oxidized to butenedioic acid and other small-molecule acids. |
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Keywords: | electro-heterogeneous catalysis electrochemical chlorobenzene intermediates |
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