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《Acta Scientiae Circumstantiae》 2004-06
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Dechlorination mechanism of chlorophenol in aqueous solution using low-temperature plasma

ZHENG Guangming,ZHU Chengzhu,ZHANG Renxi,ZHANG Jianliang,HOU Huiqi(Institute of Environmental Science, Fudan University, Shanghai200433)  
Dechlorination mechanism of 4-chlorophenol in aqueous solution in plasma has been studied by means of flat dielectric barrier discharge(DBD) and pulse radiolysis. The dechlorination of 4-chlorophenol is a pseudo first order reaction and its rate is in linear with the voltage and electrodes space. As processing time goes on, the pH value of the solution declines. It is implied by the transient absorption spectrum that, under neutral and acid conditions, 4-chlorophenol is first transformed into OH-adduct, and then dechlorinates through further reactions; while under alkaline condition, 4-chlorophenol dechlorinates by creating chlorinated phenoxyl radical directly, giving a better dechlorination rate than that under neutral and acid conditions. It is primarily the reactions between ·OH radical and 4-chlorophenol that contribute to the dechlorination of 4-chlorophenol in aqueous solution in plasma. Phenols and organic acids which are more biodegradable are the main products of 4-chlorophenol treated by DBD plasma.
【Fund】: 国家自然科学基金(项目批准号:50078052)项目
【CateGory Index】: X703
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