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Updated: Aug 22, 2025

Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
Electrochemical removal of ammonium nitrogen in high efficiency and N2 selectivity using non-noble single-atomic iron
Fengjiao Quan1, Guangming Zhan2, Bing Zhou2
1College of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Abstract:
Ammonia nitrogen (NH4+-N) is a ubiquitous environmental pollutant, especially in offshore aquaculture systems. Electrochemical oxidation is very promising to remove NH4+-N, but suffers from the use of precious metals anodes. In this work, a robust and cheap electrocatalyst, iron single-atoms distributed in nitrogen-doped carbon (Fe-SAs/N-C), was developed for electrochemical removal of NH4+-N from in wastewater containing chloride. The Fe-SAs/N-C catalyst exhibited superior activity than that of iron nanoparticles loaded carbon (Fe-NPs/N-C), unmodified carbon and conventional Ti/IrO2-TiO2-RuO2 electrodes. And high removal efficiency (> 99%) could be achieved as well as high N2 selectivity (99.5%) at low current density. Further experiments and density functional theory (DFT) calculations demonstrated the indispensable role of single-atom iron in the promoted generation of chloride derived species for efficient removal of NH4+-N. This study provides promising inexpensive catalysts for NH4+-N removal in aquaculture wastewater.
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