期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 262, 期 -, 页码 137-142出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2013.08.038
关键词
Electro-biological system; 2,4-Dichlorophenoxyacetic acid; Electron transfer; Degradation pathway
资金
- National Natural Science foundation of China [51078265]
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 x 10(-2) h(-1), 19.73 x 10(-2) h(-1) and 3.54 x 10(-2) h(-1), 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. (C) 2013 Elsevier B.V. All rights reserved.
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