A new type of continuous-flow heterogeneous electro-Fenton reactor for Tartrazine degradation

被引:38
|
作者
Zhang, Chao [1 ,2 ,3 ]
Ren, Gengbo [1 ,2 ,3 ]
Wang, Wei [1 ,2 ,3 ]
Yu, Xinmin [1 ,2 ,3 ]
Yu, Fangke [1 ,2 ,3 ]
Zhang, Qizhan [1 ,2 ,3 ]
Zhou, Minghua [1 ,2 ,3 ]
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, Coll Environm Sci & Engn, Tianjin Key Lab Urban Ecol Environm Remediat & Po, Tianjin 300350, Peoples R China
[3] Nankai Univ, Coll Environm Sci & Engn, Tianjin Adv Water Treatment Technol Int Joint Res, Tianjin 300350, Peoples R China
关键词
Continuous-flow reactor; Electro-Fenton; Fenton; Fe-C micro-electrolysis; Heterogeneous; Tartrazine; WASTE-WATER; MICRO-ELECTROLYSIS; AQUEOUS-SOLUTION; AZO-DYE; OXIDATION; ACID; REMOVAL; RED; DECOLORIZATION; ANODE;
D O I
10.1016/j.seppur.2018.05.016
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A new type of continuous-flow heterogeneous electro-Fenton (EF) reactor, in which electrochemically formed H2O2 was externally injected to the iron-carbon granules packed bed, was designed to degrade a model dye, Tartrazine. The gas diffusion electrode (GDE) can generate H2O2 efficiently, and the iron-carbon granules were used as the heterogeneous catalyst for the Fenton oxidation of the pollutants. The important operating parameters such as initial concentration of Tartrazine, pH, modified Fe-C dosage, wastewater flow rate and current were optimized. The continuous-flow EF reactor exhibited good performance even after 12 h continuous operations with the Tartrazine removal of 80% and TOC removal of nearly 30%. Compared with the conventional EF reactor, this novel continuous EF reactor can efficiently degrade the target pollutants from low concentration electrolyte. The electric energy consumption in this new type continuous-flow reactor was 0.15 kWh/(g TOC), whereas it was 0.69 kWh/(g TOC) in the batch reactor under the same experimental conditions. All results demonstrated that this novel EF system was energy-efficient and potential for treatment of wastewater without or low concentration electrolyte.
引用
收藏
页码:76 / 82
页数:7
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