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Published in: Journal of Materials Science 12/2021

20-01-2021 | Chemical routes to materials

Cu, Ni and multi-walled carbon-nanotube-modified graphite felt electrode for nitrate electroreduction in water

Authors: Chang Lu, Xiaoyun Lu, Kun Yang, Haiou Song, Shupeng Zhang, Aimin Li

Published in: Journal of Materials Science | Issue 12/2021

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Abstract

A three-dimensional bimetal carbon-based electrode, CuNi/multi-walled carbon nanotube/graphite felt (CuNi/M/GF), was designed for the electrochemical reduction of nitrate. Multi-walled carbon nanotubes (MWCNTs) served as the interlayer and skeleton, which increased the electrochemical reduction activity of GF to nitrate. CuNi/M/GF with different atomic ratios of copper and nickel was prepared by adjusting the electrodeposition potential. The performance of the CuNi/M/GF, Cu foam, Ni foam, M/GF and GF in a dual-chamber cell and single-chamber cell was evaluated for different concentrations of chlorine, current density, energy consumption and degradation. In a solution of 100 mg/L NO3-N, the removal of NO3-N and total nitrogen (TN) by the optimal electrode in a single-chamber cell (SCC) can reach 99%. Aeration in the dual-chamber cell cathode can blow out more than 99% of the ammonia nitrogen that is converted from NO3-N. More than 95% of the TN in a 100 ml, 700 mg/L NO3-N solution was removed within 6 h. CuNi/M/GF showed excellent corrosion resistance and stability in the cyclic tests. CuNi–1.3/M/GF is more resistant to corrosion in the DCC than in the SCC which may be attributed to contact of the cathode with the oxidizing substance in the SCC. The application of CuNi/M/GF in practical wastewater that contained a high concentration of NaCl and nitrate-N shows that the electrode has considerable application prospects in TN removal.

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Appendix
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Metadata
Title
Cu, Ni and multi-walled carbon-nanotube-modified graphite felt electrode for nitrate electroreduction in water
Authors
Chang Lu
Xiaoyun Lu
Kun Yang
Haiou Song
Shupeng Zhang
Aimin Li
Publication date
20-01-2021
Publisher
Springer US
Published in
Journal of Materials Science / Issue 12/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-020-05764-3

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