Citation: Qishen Wang, Changzhao Chen, Mengqing Li, Lingmin Wu, Kai Dai. Lignin derived carbon quantum dots and oxygen vacancies coregulated S-scheme LCQDs/Bi₂WO₆ heterojunction for photocatalytic H₂O₂ production[J]. Acta Physico-Chimica Sinica, ;2025, 41(11): 100147. doi: 10.1016/j.actphy.2025.100147 shu

Lignin derived carbon quantum dots and oxygen vacancies coregulated S-scheme LCQDs/Bi₂WO₆ heterojunction for photocatalytic H₂O₂ production

Qishen Wang ¹ ,
Changzhao Chen ^1,, ,
Mengqing Li ¹ ,
Lingmin Wu ^2,, ,
Kai Dai ^3,,

1.
School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan 232001, Anhui Province, China
2.
Guangdong Provincial Key Laboratory of Fuel Cell Technology School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong Province, China
3.
Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University, Huaibei 235000, Anhui Province, China

Corresponding author: Changzhao Chen, chzhchen@aust.edu.cn Lingmin Wu, 202110184982@mail.scut.edu.cn Kai Dai, daikai940@chnu.edu.cn
Received Date: 6 July 2025
Revised Date: 30 July 2025
Accepted Date: 3 August 2025

Fund Project: the National Natural Science Foundation of China 22278169the National Natural Science Foundation of China 12304134the Excellent Scientific Research and Innovation Team of Education Department of Anhui Province 2022AH010028the Natural Science Foundation of Anhui Province 2108085ME148

This study presents an innovative photocatalytic system utilizing waste biomass resources for sustainable synthesis of hydrogen peroxide (H₂O₂) and high-value lignin derivatives. A lignin derived carbon quantum dots (LCQDs) loaded S-scheme heterojunction photocatalyst LCQDs/Bi₂WO₆ (LCD/BWO) was synthesized via hydrothermal method. The LCD/BWO composite demonstrates exceptional H₂O₂ production rate (3.776 mmol·h⁻¹·g⁻¹) and maintains 89.72% activity retention after 5 cycles under visible light irradiation, representing a 5.97-fold enhancement over catalyst BWO−A. The performance leap stems from synergistic effects between LCQDs and oxygen vacancies (OVs) defects: the unique up-conversion luminescence of LCQDs combined with S-scheme charge transfer mechanism enhances light absorption and carrier separation efficiency, while interfacial OVs act as electron traps to prolong carrier lifetime. In situ electron paramagnetic resonance (In situ EPR) analysis revealed substantial generation of •O₂⁻ and •OH radicals on catalyst surfaces. Band structure characterization confirms optimized H₂O₂ synthesis through consecutive single-electron reactions. Synergistic regulation of band positions significantly enhances oxygen reduction reaction (ORR) and water oxidation reaction (WOR) capabilities. As lignin primarily originates from agricultural/forestry waste, this work not only provides new design strategies for efficient photocatalytic systems but also advances high−value utilization of waste biomass resources.
- Lignin-derived carbon quantum dots (LCQDs),
- Oxygen vacancies (OVs),
- S-scheme heterojunction,
- In situ EPR,
- H₂O₂ production
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Lignin derived carbon quantum dots and oxygen vacancies coregulated S-scheme LCQDs/Bi2WO6 heterojunction for photocatalytic H2O2 production

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通讯作者: 陈斌, bchen63@163.com

Lignin derived carbon quantum dots and oxygen vacancies coregulated S-scheme LCQDs/Bi₂WO₆ heterojunction for photocatalytic H₂O₂ production