Degradation characteristics of 2,4-dichlorophenoxyacetic acid in electro-biological system

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• 作者：JingLi Zhang ; ZhanPing Cao ; HongWei Zhang ; LianMei Zhao ; XuDong Sun ; Feng Mei
• 关键词：Electro-biological system ; 2 ; 4-Dichlorophenoxyacetic acid ; Electron transfer ; Degradation pathway
• 刊名：Journal of Hazardous Materials
• 出版年：15 November, 2013
• 年：2013
• 卷：262
• 期：Complete
• 页码：137-142
• 全文大小：985 K

文摘

The reductive degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) was studied in an electro-biological system, a biological system and an electric catalytic system, respectively. Electrochemical characteristics were monitored by cyclic voltammetry and the intermediate products of 2,4-D degradation were determined by high speed liquid chromatography (HPLC). The results showed that all 2,4-D degradations in the three systems conformed to the kinetics characteristics of one-order reaction, and the degradation kinetics constants were 28.74 脳 10^鈭? h^鈭?, 19.73 脳 10^鈭? h^鈭? and 3.54 脳 10^鈭? h^鈭?, respectively. The kinetics constant in the electro-biological system was higher than the sum in the other two systems by 19%. The electrochemical assistance provided the electrons and accelerated the electron transfer rate in the microbial degradation of 2,4-D. The degradation resulted from the microbial reduction strengthened by the electrochemical assistance. The electron transfer existed between the electrode, cytochrome, NAD and the pollutants. A long-range electron transfer process could be achieved on the multi-phase interfaces between the electrode, bacteria and the pollutants.