In situ electro-generated Ni(OH)2 synergistic with Cu cathode to promote direct ammonia oxidation to nitrogen

To solve the problem of low removal rate and poor N2 selectivity in direct electrochemical ammonia oxidation (EAO), commercial Ni foam and Cu foam were used as anode and cathode of the EAO system, respectively. The coupling effect between the cathode and anode promoted nitrogen cycling during the re...

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Bibliographic Details
Published in:Water science and technology Vol. 90; no. 1; pp. 225 - 237
Main Authors: Xue, Yuzhou, Wang, Xuanxuan, Liu, Qing, Feng, Mengru, Ding, Zimo, Chu, Jiayue, Zhu, Wenyan, Liu, Na, Li, Zhichun
Format: Journal Article
Language:English
Published: England IWA Publishing 01.07.2024
Subjects:
Ammonia - chemistry
Copper - chemistry
coupling effect
direct electrochemical ammonia oxidation
Electrochemical Techniques - methods
Electrodes
goose-raising wastewater
Hydroxides - chemistry
n2 selectivity
Nickel - chemistry
Nitrogen - chemistry
nitrogen cycle
Oxidation-Reduction
Waste Disposal, Fluid - methods
Wastewater - chemistry
Water Pollutants, Chemical - chemistry
selectivity
coupling effect
direct electrochemical ammonia oxidation
nitrogen cycle
goose-raising wastewater
N
ISSN:0273-1223, 1996-9732
Online Access:Get full text
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Summary:To solve the problem of low removal rate and poor N2 selectivity in direct electrochemical ammonia oxidation (EAO), commercial Ni foam and Cu foam were used as anode and cathode of the EAO system, respectively. The coupling effect between the cathode and anode promoted nitrogen cycling during the reaction process, which improved N2 selectivity of the reaction system and promoted it to achieve a high ammonia removal rate. This study showed that the thin Ni(OH)2 with oxygen vacancy formed on the surface of Ni foam anode played an effective role in the dimerization of intermediate products in ammonia oxidation to form N2. This electrochemical system was used to treat real goose wastewater containing 422.5 mg/L NH4+-N and 94.5 mg/L total organic carbon (TOC). After treatment, this electrochemical system achieved good performance with an ammonia removal rate of 87%, N2 selectivity of 77%, and TOC removal rate of 72%. Therefore, this simple and efficient system with Ni foam anode and Cu foam cathode is a promising method for treating ammonia nitrogen wastewater.
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ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2024.214