Degradation of 2,4-dichlorophenoxyacetic acid by anodic oxidation and electro-Fenton using BDD anode: Influencing factors and mechanism

被引:78
作者
Cai, Jingju [1 ,2 ,3 ,4 ]
Zhou, Minghua [1 ]
Pan, Yuwei [1 ,2 ,3 ,4 ]
Lu, Xiaoye [1 ,2 ,3 ,4 ]
机构
[1] Nankai Univ, Coll Environm Sci & Engn, Minist Educ, Key Lab Pollut Proc & Environm Criteria, Tianjin 300350, Peoples R China
[2] Nankai Univ, Tianjin Key Lab Environm Technol Complex Transmed, Tianjin 300350, Peoples R China
[3] Nankai Univ, Coll Environm Sci & Engn, Tianjin Key Lab Urban Ecol Environm Remediat & Po, Tianjin 300350, Peoples R China
[4] Nankai Univ, Coll Environm Sci & Engn, Tianjin Adv Water Treatment Technol Int Joint Res, Tianjin 300350, Peoples R China
基金
中国国家自然科学基金;
关键词
2; 4-Dichlorophenoxyacetic acid; BDD; Anodic oxidation; Electro-Fenton; Modified graphite felt cathode; MODIFIED GRAPHITE FELT; REVERSE-OSMOSIS CONCENTRATE; ELECTROCHEMICAL OXIDATION; WASTE-WATER; HYDROGEN-PEROXIDE; 2,4-D; MINERALIZATION; ELECTROOXIDATION; REMOVAL; CATHODE;
D O I
10.1016/j.seppur.2019.115867
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) was conducted by anodic oxidation (AO) with a boron-doped diamond (BDD) anode, and was greatly enhanced by combination with electro-Fenton (EF) using carbon black modified graphite felt (CB-GF) as cathode. A high current density, low initial pH and high concentration of Na2SO4 favored for the 2,4-D degradation by AO. In EF, 2,4-D degradation rate increased 8 times after using CB-GF cathode, obtaining a higher mineralization current efficiency (53%) and a lower energy consumption (71.8 kWh kg(-1) TOC) due to the higher generation of H2O2. It indicated that the mainly contributing radicals for 2,4-D degradation by AO was (OH)-O-center dot (57.5%), while the contribution improved to 92% by EF. Compared with AO, EF was more efficient and complete for 2,4-D degradation, confirmed by the detection of the main degradation intermediates and short-chain carboxylic acids. This work demonstrated that EF using BDD anode and high-performance CB-GF cathode was efficient for 2,4-D degradation, which would be a promising electrochemical advanced oxidation process for organic wastewater treatment.
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页数:9
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