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	Comparative study on electrochemical degradation of 2,4-dichlorophenol by different Pd/C gas-diffusion cathodes
	Wang, Hui ; Wang, Jianlong
	2010-10-12 ; 2010-10-12
关键词	Electrochemical oxidation Gas-diffusion cathode Pd/C catalyst Chlorophenol Priority pollutant WASTE-WATER TREATMENT ELECTRO-FENTON ELECTROCATALYTIC DECHLORINATION REDUCTIVE DECHLORINATION CHLORINATED PHENOLS PEROXI-COAGULATION ORGANIC POLLUTANTS ANODIC-OXIDATION ACTIVATED CARBON O-2-FED CATHODE Chemistry, Physical Engineering, Environmental Engineering, Chemical
中文摘要	Pd/C catalysts used for the Pd/C gas-diffusion cathodes were prepared by the hydrogen gas and/or formaldehyde reduction, and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). The electrochemical degradation of 2,4-dichlorophenol was investigated in a diaphragm electrolysis system, feeding with hydrogen gas then with air, using three different self-made gas-diffusion cathodes. The results indicated that the Pd/C gas-diffusion cathodes can not only reductively dechlorinate 2,4-dichlorophenols by feeding hydrogen gas, but also accelerate the two-electron reduction of oxygen (O-2) to hydrogen peroxide (H2O2) by feeding air. Therefore, both the removal efficiency and the dechlorination degree of 2,4-dichlorophenol all reached about 100% after 80 min by using Pd/C gas-diffusion cathode, which were better than that of the carbon/polytetrafluoroethylene (C/PTFE) gas-diffusion cathode (no catalyst). The Pd/C catalyst prepared by the hydrogen reduction method had higher stability and catalytic activity than that prepared by the formaldehyde reduction method. By high-performance liquid chromatogram (HPLC), the main intermediates of 2,4-dichlorophenol dechlorination in the cathodic compartment were identified as 4-chlorophenol and 2-chlorophenol, which could be further dechlorinated to form phenol. Hydroquinone was the first intermediate formed from the oxidation of phenol, which was subsequently dehydrogenated to benzoquinone. The further oxidation of benzoquinone, after benzene ring cleavage, led to the formation of aliphatic carboxylic acids such as maleic, fumaric, and oxalic acids. (C) 2009 Elsevier B.V. All rights reserved.
语种	英语 ; 英语
出版者	ELSEVIER SCIENCE BV ; AMSTERDAM ; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79281]
专题	清华大学
推荐引用方式 GB/T 7714	Wang, Hui,Wang, Jianlong. Comparative study on electrochemical degradation of 2,4-dichlorophenol by different Pd/C gas-diffusion cathodes[J],2010, 2010.
APA	Wang, Hui,&Wang, Jianlong.(2010).Comparative study on electrochemical degradation of 2,4-dichlorophenol by different Pd/C gas-diffusion cathodes..
MLA	Wang, Hui,et al."Comparative study on electrochemical degradation of 2,4-dichlorophenol by different Pd/C gas-diffusion cathodes".(2010).

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