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Co-N-doped MoO2 modified carbon felt cathode for removal of EDTA-Ni in electro-Fenton process

Co-N-doped MoO2 modified carbon felt cathode for removal of EDTA-Ni in electro-Fenton process 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 μA) 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 (•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 •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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Science and Pollution Research Springer Journals

Co-N-doped MoO2 modified carbon felt cathode for removal of EDTA-Ni in electro-Fenton process

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Environment; Environment, general; Environmental Chemistry; Ecotoxicology; Environmental Health; Atmospheric Protection/Air Quality Control/Air Pollution; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution
ISSN
0944-1344
eISSN
1614-7499
DOI
10.1007/s11356-018-2373-8
Publisher site
See Article on Publisher Site

Abstract

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 μA) 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 (•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 •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.

Journal

Environmental Science and Pollution ResearchSpringer Journals

Published: May 31, 2018

References