Citation: Jiangli Sun, Chaohui Zhang, Yican Zhang, Chunhong Fu, Ruiheng Liang, Zhongzheng Hu, Ge Song, Minghua Zhou. Ag₃PO₄/g-C₃N₄ S-scheme heterojunction photoanode coupled with natural air diffusion electrode for efficient organic pollutants degradation and H₂O₂ generation[J]. Chinese Chemical Letters, ;2026, 37(5): 111839. doi: 10.1016/j.cclet.2025.111839 shu

Ag₃PO₄/g-C₃N₄ S-scheme heterojunction photoanode coupled with natural air diffusion electrode for efficient organic pollutants degradation and H₂O₂ generation

Jiangli Sun ^{a, b, c} ,
Chaohui Zhang ^{a, b, c} ,
Yican Zhang ^{a, b, c} ,
Chunhong Fu ^{a, b, c} ,
Ruiheng Liang ^{a, b, c} ,
Zhongzheng Hu ^{a, b, c} ,
Ge Song ^{a, b, c} ,
Minghua Zhou ^{a, b, c, *,}

a.
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
b.
Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
c.
Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China

zhoumh@nankai.edu.cn

Received Date: 3 April 2025
Revised Date: 7 September 2025
Accepted Date: 15 September 2025
Available Online: 15 September 2025

Figures(8)

The utilization of photoelectrocatalytic (PEC) technology for water pollution treatment and value-added chemical production is important in sustainable development strategies. A system combining Ag₃PO₄/g-C₃N₄ S-scheme heterojunction photoanodic oxidation with natural air diffusion electrode (NADE) reduction was designed. The PEC system could remove 94.5% of tetracycline (TC) with the first-order kinetic rate constant of 0.148 min^-1, while the H₂O₂ yield in the cathodic chamber reached 4.3 µmol^-1 h^-1 cm^-2 under 2.0 V cell voltage. The rate constant of TC degradation by the Ag₃PO₄/g-C₃N₄ coupled NADE PEC system was 4.4 times that of Ag₃PO₄/g-C₃N₄ coupled Pt PEC system (0.034 min^-1). This was attributed to the synergistic effect between accelerated photoanode carrier transfer and increased H₂O₂ yield. The production of H₂O₂ in the cathode chamber of the PEC system with the presence of TC was 2.3 times that of absence of TC (1.9 µmol^-1 h^-1 cm^-2). The active substances playing a major role in this PEC system were mainly h⁺ followed by ^•OH. Significantly, the efficient operation of the PEC system under actual sunlight will be conducive to the exploration of practical applications in the future. This study provides new insights for constructing efficient cathode-anode coupled PEC systems for water purification and simultaneous H₂O₂ production.
- Photoelectrocatalysis,
- S-scheme heterojunction,
- H₂O₂ production,
- Wastewater purification,
- Synergistic effect
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Ag3PO4/g-C3N4 S-scheme heterojunction photoanode coupled with natural air diffusion electrode for efficient organic pollutants degradation and H2O2 generation

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通讯作者: 陈斌, bchen63@163.com

Ag₃PO₄/g-C₃N₄ S-scheme heterojunction photoanode coupled with natural air diffusion electrode for efficient organic pollutants degradation and H₂O₂ generation