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Updated: May 5, 2026
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Electroreduces nitrate to ammonia and converts to nitrogen through chloride ions by Co3O4/GF cathode: Performance,
Yuankun Liu1, Xiaotian Guo1, Xing Li1
1College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China.
Abstract:
With the development of cities, the issue of excess nitrate in wastewater has become increasingly severe. Electrochemical technology has garnered significant attention due to its straightforward operation and environmental sustainability. A Co3O4/GF cathode was successfully prepared by depositing Co3O4 onto Graphite felt (GF) using an electrochemical deposition-calcination method. The effects of electrochemical reduction of nitrate (NO3--N) using Co3O4/GF cathodes were investigated. The removal rate of NO3--N achieved an impressive 98.6% with the Co3O4/GF cathode, and the formation rate of reduced ammonia (NH4+-N) was 100% within 2 h at -1.61 V vs. Ag/AgCl voltage. The optimal removal efficiency for NO3--N occurred at a pH of 5. In addition, the electrode demonstrated excellent recyclability and stability. In the presence of Cl-, N2 was produced instead of NH4+ through mediated oxidation. NH4+-N was oxidized to N2 under the action of Cl-. When the concentration of KCl reached 3000 mg/L, the total nitrogen removal rate achieved 98.63%. The reduction mechanism for NO3- reduction was confirmed through electrochemical analysis, scavenging experiments and XPS analysis: on the one hand, it was caused by the Co2+ -Co3+ -Co2+ process. On the other hand, it was caused by indirect reduction mediated by H∗. This study presents an efficient and environmentally friendly method for converting NO3--N to NH4+-N while simultaneously controlling NH4+-N production through chlorine addition, providing a theoretical foundation for the degradation of NO3--N from wastewater.
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