物理化学学报 >> 2025, Vol. 41 >> Issue (11): 100147.doi: 10.1016/j.actphy.2025.100147

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木质素基碳量子点与氧空位协同调控的S型LCQDs/Bi2WO6异质结用于光催化H2O2生产

王其申1, 陈昌兆1,*(), 李孟卿1, 吴玲敏2,*(), 代凯3,*()   

  1. 1 安徽理工大学力学与光电物理学院, 安徽 淮南 232001
    2 华南理工大学化学与化工学院燃料电池技术广东省重点实验室, 广东 广州 510640
    3 淮北师范大学污染物敏感材料与环境修复安徽省重点实验室, 绿色和精准合成化学及应用教育部重点实验室, 安徽 淮北 235000
  • 收稿日期:2025-07-06 修回日期:2025-07-30 录用日期:2025-08-03 发布日期:2025-09-29
  • 通讯作者: Email: chzhchen@aust.edu.cn (陈昌兆)202110184982@mail.scut.edu.cn (吴玲敏)daikai940@chnu.edu.cn (代凯)
  • 基金资助:
    国家自然科学基金(22278169); 国家自然科学基金(12304134); 安徽省教育厅优秀科研创新团队(2022AH010028); 安徽省自然科学基金(2108085ME148)

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

Qishen Wang1, Changzhao Chen1,*(), Mengqing Li1, Lingmin Wu2,*(), Kai Dai3,*()   

  1. 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
  • Received:2025-07-06 Revised:2025-07-30 Accepted:2025-08-03 Published:2025-09-29
  • Contact: Email: chzhchen@aust.edu.cn (Changzhao Chen)202110184982@mail.scut.edu.cn (Lingmin Wu)daikai940@chnu.edu.cn (Kai Dai)
  • Supported by:
    the National Natural Science Foundation of China(22278169); the National Natural Science Foundation of China(12304134); the Excellent Scientific Research and Innovation Team of Education Department of Anhui Province(2022AH010028); the Natural Science Foundation of Anhui Province(2108085ME148)

摘要:

光催化制备H2O2与高值木质素技术创新了绿色化学合成和废弃生物质转化的相关途径。本研究通过水热法合成了木质素基碳量子点(LCQDs),并构建了S型异质结光催化剂LCQDs/Bi2WO6以高效生产H2O2,其在模拟可见光下展现出优异的H2O2产率(3.776 mmol·h−1·g−1),较BWO−A样品提升5.97倍,在五轮循环后仍可保持89.72%的性能。这一突破源于LCQDs与氧空位缺陷的协同调控:LCQDs独特的上转换发光特性结合S型电荷转移路径,有效增强了光吸收能力和载流子分离效率,而氧空位作为电子陷阱则延长了载流子寿命。结合原位电子顺磁共振分析和能带结构表征,我们证实了反应途中•O2⁻和•OH自由基的大量存在,复合材料主要通过连续单电子反应优化H2O2合成路径,经过导带与价带位置的同步调整,增强了氧还原反应(ORR)与水氧化反应(WOR)能力。鉴于木质素的主要来源为农林废弃物,该研究不仅为高性能光催化体系的设计提供了新策略,还显著推动了废弃生物质资源的高值化利用。

关键词: 木质素基碳量子点(LCQDs), 氧空位(OVs), S型异质结, 原位电子顺磁共振, H2O2生产

Abstract:

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.

Key words: Lignin-derived carbon quantum dots (LCQDs), Oxygen vacancies (OVs), S-scheme heterojunction, In situ EPR, H2O2 production