Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 23, Pages 22754-22765Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2373-8
Keywords
Co-N-doped; Oxygen reduction reaction; Electro-Fenton; EDTA-Ni
Categories
Funding
- National Nature Science Foundation of China [21677052]
- Major Science and Technology Program for the Industry-Academia-Research Collaborative Innovation [201704020206]
- Guangdong Water Conservancy Science and Technology Innovation Project [2017-25]
- Guangdong Province Science and Technology Project [2016B090918104, 2016B020240005, 2017A020216013]
- Guangdong Province [U1401235]
- Zhanjiang of Guangdong Energy Co. [ZY-KJ-YX-2016X085F]
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Metal ions removal is inhibited in aqueous solution containing ethylenediaminetetraacetic acid (EDTA). In this study, the non-noble metals-based Co-N-doped MoO2 nanowires (Co-N-MoO2) were successfully synthesized using cyanamide and Co(Ac)(2) as precursors by pyrolysis, then immobilized on carbon felt (CF), and firstly used as cathode to remove EDTA-Ni complex through oxygen reduction reaction (ORR) in electro-Fenton (EF) process. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicated that a synergetic coupling effect of doping of N and Co induced structural modifications of MoO2 lattice, and produced more lattice defects. The electrochemical analysis results showed that the superior ORR electrochemical catalysis activities were obtained at pH = 3 with the lowest cathodic peak potentials (- 0.157 V vs. Ag/AgCl), the highest electrochemical active surface area (EASA: 3.971 mC cm(-2)), the extraordinarily high of the ring current (35.5 mu A) and high H2O2 yield (> 20%). Under the optimum conditions, about 68% of EDTA-Ni was removed with the Co-N-MoO2/CF as cathode after 120 min with lower specific energy consumption (0.0226 kW h mg(-1) (DOC)) in EF system. Mechanism analysis indicated that the production of strong oxidizing property of hydroxyl radical (aEuro cent OH) on the cathode played an important role in the removal of EDTA-Ni in the EF process, synergetic effect of cobalt and nitrogen co-doped could facilitate the high generation of H2O2, which greatly promote the formation of aEuro cent OH. The EF system with Co-N-MoO2/CF cathode has a potential for breaking metal-complex with good stability, showing that this cathode is a candidate for application for applications in EAPOs.
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