期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 257, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.117902
关键词
TiO(2)nanotubes; Electrochemical advanced oxidation processes; Boron-doped diamond; Phenol degradation; Hydroxyl radical and sulfate radical
资金
- Natural Science Foundation of China [21773129, 21811530274, 21273120]
- Key Project of Natural Science Foundation of Tianjin [16JCZDJC39300]
- National Key Research and Development Program [2016YFC0400706]
- National Special S&T Project on Water Pollution Control and Management [2017ZX07107002]
- 111 program, Ministry of Education, China [T2017002]
- Fundamental Research Funds for the Central Universities
Efficient anode materials are essential to electrochemical advanced oxidation processes (EAOPs) for organic wastewater treatment. In this regard, blue TiO2 nanotube arrays (Blue-TNA) anode was prepared for the first time in formic acid electrolyte by electrochemical self-doping and applied for electrochemical degradation of contaminants. Characterized by XPS, Raman and Mott-Schottky curves, the formation of Ti3+ on Blue-TNA was confirmed. This anode was more efficient and had a higher hydroxyl radical production activity (1.7 x 10(-14) M) than BDD (9.8 x 10(-15) M), inducing a higher TOC and COD removal of 100 mg/L phenol with a lower energy consumption of 9.9 kW h/(kg COD) at current density 2.5 mA/cm(2), pH 5 in 0.1 M Na2SO4, account for the lower accumulation of degradation intermediates. Both (OH)-O-center dot and SO4 center dot- were responsible for the degradation on Blue-TNA anode, while their contributions differed greatly with that of BDD, and could be affected and regulated by the operating parameters like current density, initial pH and Na2SO4 concentration. Blue-TNA anode represented a relative stable performance for 5 cycles degradation of 100 mg/L phenol for each cycle of 300 min, and such an oxidation capacity could be easily regenerated by electrochemical reduction in formic acid. Blue-TNA anode had an excellent performance on the TOC removal and MCE especially at low current density of 2.5 mA/cm(2) when compared with other anodes. Therefore, Blue-TNA anode is hopeful a promising and cost-effective anode for electrochemical oxidation.
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