Citation: Xia Chen, Ting Dai, Meng-Ying Yin, Xing-Yuan Xia, Qiu-Ju Xing, Lei Tian, Jian-Ping Zou. Enhanced anodic mass transfer enables interfacial Cl^• for efficient ammonia oxidation[J]. Chinese Chemical Letters, ;2026, 37(3): 111445. doi: 10.1016/j.cclet.2025.111445 shu

Enhanced anodic mass transfer enables interfacial Cl^• for efficient ammonia oxidation

Xia Chen ^a ,
Ting Dai ^a ,
Meng-Ying Yin ^a ,
Xing-Yuan Xia ^a ,
Qiu-Ju Xing ^a ,
Lei Tian ^{a, b, *,} ,
Jian-Ping Zou ^{a, *,}

a.
Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse, Nanchang Hangkong University, Nanchang 330063, China
b.
School of Chemistry and Chemical Engineering, Institute of Clean Energy and Materials, Key Laboratory for Clean Energy and Materials, Ministry of Education, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou 510006, China

leitian3315@126.com

zjp_112@126.com

Received Date: 20 December 2024
Revised Date: 22 April 2025
Accepted Date: 10 June 2025
Available Online: 11 June 2025

Figures(4)

The electrostatic repulsion between the anode and ammonia (NH₄⁺) can cause chlorine radicals (Cl^•) at the interface to self-compounding into low oxidating species, weakening the treatment performance of ammonia-nitrogen (NH₄⁺-N) wastewater. This study introduces electron-rich elements into the tetrahedral sites (A_Td²⁺) of spinel cobalt oxide (Co₃O₄) for efficient and selective NH₄⁺-N mineralization induced by interfacial Cl^•. Batch experiments, in-situ characterizations, and theoretical calculations confirm that Cu_Td²⁺ have moderate energy level matching and strong binding energy with NH₄⁺ compared to Ni_Td²⁺ and Zn_Td²⁺. NH₄⁺ can effectively overcome electrostatic repulsion and enrich on Cu_xCo_3-xO₄ anode. More importantly, the interaction of Cu_Td²⁺-O-Co_Oh³⁺ weakens the binding of Cl^• at Co_Oh³⁺ sites, promoting the desorption of Cl^• from the anodic interface. As a result, NH₄⁺-N is mineralized by Cl^• into N₂ with a rate of 4.4 × 10^–² min^-1, superior to Co₃O₄ and commercial dimensionally stable anodes. Finally, the scale-up experiment using a continuous flow reactor realizes long-term stability for NH₄⁺-N wastewater treatment, in which 100% of NH₄⁺-N and 88.3% of total nitrogen can be continuously eliminated in 96 h. This study offers an in-depth understanding of interfacial reactions in the EC system and guides the design and synthesis of superior anodes for environmental remediation.
- Electrocatalytic system,
- Ammonia-nitrogen oxidation,
- Chlorine radical,
- Mass transfer,
- Mineralization
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沈阳化工大学材料科学与工程学院沈阳 110142

Enhanced anodic mass transfer enables interfacial Cl• for efficient ammonia oxidation

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通讯作者: 陈斌, bchen63@163.com

Enhanced anodic mass transfer enables interfacial Cl^• for efficient ammonia oxidation