Citation: Mengqing Li, Changzhao Chen, Qishen Wang, Kai Dai. S-scheme GQDs/Bi24O31Br10 heterojunction boosts photocatalytic H2O2 production and tetracycline degradation[J]. Chinese Journal of Structural Chemistry, ;2026, 45(7): 100891. doi: 10.1016/j.cjsc.2026.100891 shu

S-scheme GQDs/Bi24O31Br10 heterojunction boosts photocatalytic H2O2 production and tetracycline degradation

GQDs/Bi24O31Br10 S-scheme heterojunction composite was successfully constructed via a hydrothermal method and systematically evaluated its bifunctional performance in photocatalytic antibiotic (TC) degradation and hydrogen peroxide (H2O2) production. Results demonstrate that the optimized composite exhibits excellent activity in both reactions, it achieved a tetracycline degradation rate of 88.5% within 20 min, and H2O2 production yield of 104.53 μM within the same time, which is 4.2 times that of pure Bi24O31Br10. Mechanism studies reveal that the superoxide radical serves as a key reactive species, acting as both a crucial intermediate for H2O2 synthesis and the dominant active species for TC degradation. The built-in electric field at S-scheme heterojunction interface enables efficient spatial separation of photogenerated carriers, highly reductive electrons accumulate on graphene quantum dots (GQDs) to promote the two-step single-electron reduction of O2 for H2O2 generation, while strongly oxidative holes remain on Bi24O31Br10 to maintain degradation capability. This work not only develops an efficient and stable bifunctional photocatalyst but also elucidates, at the microscopic scale, the S-scheme heterojunction synergistically drives different reactions through precise regulation of charge transfer pathways, providing a theoretical foundation and practical guidance for designing novel photocatalytic systems for environmental remediation and green synthesis.
- S-scheme heterojunction,
- Bifunctional photocatalyst,
- Photocatalytic H2O2 production,
- Antibiotic degradation,
- Charge separation
1. [1]
  Yonghui Ma , Lei Ji , Jinfeng Zhang , Graham Dawson , Kai Dai . Efficient charge separation of RF/CdTMT S-scheme photocatalyst with enhanced photocatalytic H2O2 production. Chinese Journal of Structural Chemistry, 2026, 45(6): 100887-100887. doi: 10.1016/j.cjsc.2026.100887
2. [2]
  Yuanjin He , Hao Yang , Qiwei Guo , Bo Zhou , Xuqiang Hao , Zhiliang Jin . Sulfur-vacancy engineered SmCoO3/MnCdS S-scheme heterojunction for efficient photothermal-photocatalytic H2 evolution. Chinese Journal of Structural Chemistry, 2026, 45(8): 100965-100965. doi: 10.1016/j.cjsc.2026.100965
3. [3]
  Wanxin Hu , Yan Shi , Junxia Yu , Haiyang Shi , Yingping Huang , Ruiping Li . Engineering 2D/2D FeOOH/BiOCl S-scheme heterojunction toward efficient and stable tetracycline photodegradation. Chinese Journal of Structural Chemistry, 2026, 45(3): 100832-100832. doi: 10.1016/j.cjsc.2025.100832
4. [4]
  Zhen Shi , Wei Jin , Yuhang Sun , Xu Li , Liang Mao , Xiaoyan Cai , Zaizhu Lou . Interface charge separation in Cu2CoSnS4/ZnIn2S4 heterojunction for boosting photocatalytic hydrogen production. Chinese Journal of Structural Chemistry, 2023, 42(12): 100201-100201. doi: 10.1016/j.cjsc.2023.100201
5. [5]
  Limin Yu , Lijing Wang , Huanning Li , Pan Li , Hongxia Liu , Meng Liu , Junjie Zhang , Wei Wei , Shijie Li . Ti–Cl bond induced fast electron transfer in OH⁻ regulated SrBi₄Ti₄O₁₅/BiOCl for enhanced piezo-photocatalytic antibiotic degradation. Chinese Chemical Letters, 2026, 37(7): 112228-. doi: 10.1016/j.cclet.2025.112228
6. [6]
  Haoyuan Qin , Lijing Wang , Yuanhao Tang , Weilong Shi , Changyu Lu . Modulating charge kinetics in CDs/CTF S-scheme hybrids for enhanced H₂O₂ photosynthesis. Chinese Journal of Structural Chemistry, 2026, 45(4): 100858-100858. doi: 10.1016/j.cjsc.2025.100858
7. [7]
  Tuo Guo , Guojing Hu , Jiaxin Liu , Li Chen , Guangmin Ren , Qingjie Guo . Defect-enhanced charge separation in ZnCdS/WS2 S-scheme heterojunctions: Engineering sulfur vacancies to facilitate photocatalytic H2 production. Chinese Journal of Structural Chemistry, 2026, 45(8): 100960-100960. doi: 10.1016/j.cjsc.2026.100960
8. [8]
  Yihu Ke , Shuai Wang , Fei Jin , Guangbo Liu , Zhiliang Jin , Noritatsu Tsubaki . Charge transfer optimization: Role of Cu-graphdiyne/NiCoMoO4 S-scheme heterojunction and Ohmic junction. Chinese Journal of Structural Chemistry, 2024, 43(12): 100458-100458. doi: 10.1016/j.cjsc.2024.100458
9. [9]
  Haitao Ren , Zongcheng Miao , Xiangbo Feng , Abdelkader Labidi , Yuzhen Zhao , Chuanyi Wang . Modulating the built-in electric field of S-scheme heterojunction via oxygen vacancies for boosting photocatalytic ciprofloxacin degradation. Chinese Chemical Letters, 2026, 37(10): 112557-. doi: 10.1016/j.cclet.2026.112557
10. [10]
  Fei Jin , Bolin Yang , Xuanpu Wang , Teng Li , Noritatsu Tsubaki , Zhiliang Jin . Facilitating efficient photocatalytic hydrogen evolution via enhanced carrier migration at MOF-on-MOF S-scheme heterojunction interfaces through a graphdiyne (CnH2n-2) electron transport layer. Chinese Journal of Structural Chemistry, 2023, 42(12): 100198-100198. doi: 10.1016/j.cjsc.2023.100198
11. [11]
  Zhiyuan Qin , Haosheng Li , Song Li , Heng Yang , Juntao Yan , Qiang Ma , Xiaofang Li . High-crystalline g-C3N4/BiOIO3 S-scheme heterojunction for efficient photocatalytic CO2 reduction. Chinese Journal of Structural Chemistry, 2026, 45(9): 100969-100969. doi: 10.1016/j.cjsc.2026.100969
12. [12]
  Wenqi Wang , Xiajie Zhang , Ting Gao , Lin Ju , Dongqiu Zhao , Enzhou Liu . Boosting H2S conversion with S-scheme Cd0.5Zn0.5S/TiO2 nanotube arrays photoanode. Chinese Journal of Structural Chemistry, 2026, 45(8): 100961-100961. doi: 10.1016/j.cjsc.2026.100961
13. [13]
  Kaihui Huang , Boning Feng , Xinghua Wen , Lei Hao , Difa Xu , Guijie Liang , Rongchen Shen , Xin Li . Effective photocatalytic hydrogen evolution by Ti3C2-modified CdS synergized with N-doped C-coated Cu2O in S-scheme heterojunctions. Chinese Journal of Structural Chemistry, 2023, 42(12): 100204-100204. doi: 10.1016/j.cjsc.2023.100204
14. [14]
  Linping Li , Junhui Su , Yanping Qiu , Yangqin Gao , Ning Li , Lei Ge . Design and fabrication of ternary Au/Co3O4/ZnCdS spherical composite photocatalyst for facilitating efficient photocatalytic hydrogen production. Chinese Journal of Structural Chemistry, 2024, 43(12): 100472-100472. doi: 10.1016/j.cjsc.2024.100472
15. [15]
  Zhi Zhu , Xiaohan Xing , Qi Qi , Wenjing Shen , Hongyue Wu , Dongyi Li , Binrong Li , Jialin Liang , Xu Tang , Jun Zhao , Hongping Li , Pengwei Huo . Fabrication of graphene modified CeO2/g-C3N4 heterostructures for photocatalytic degradation of organic pollutants. Chinese Journal of Structural Chemistry, 2023, 42(12): 100194-100194. doi: 10.1016/j.cjsc.2023.100194
16. [16]
  Qiuwen Wang , Linlin Liang , Zexun Li , Jinyu Zhu , Kang Wang , Fuqiang Zhang , Zhijun Ren , Pengfei Wang . Constructing Fe-S bond enhanced charge transfer in α-Fe₂O₃/Cd_0.9Zn_0.1S S-scheme heterojunction for simultaneous oxidation of ciprofloxacin and reduction of Cr(Ⅵ). Chinese Chemical Letters, 2026, 37(6): 112066-. doi: 10.1016/j.cclet.2025.112066
17. [17]
  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. Chinese Chemical Letters, 2026, 37(5): 111839-. doi: 10.1016/j.cclet.2025.111839
18. [18]
  Sikai Wu , Xuefei Wang , Huogen Yu . Hydroxyl-enriched hydrous tin dioxide-coated BiVO4 with boosted photocatalytic H2O2 production. Chinese Journal of Structural Chemistry, 2024, 43(12): 100457-100457. doi: 10.1016/j.cjsc.2024.100457
19. [19]
  Mingze AN , Bingbing ZHANG , Zhao YANG , Hao PU , Weijie CHEN , Bin XUE , Sheng WANG , Xiaoyan DING , Lulu SHI . Construction of an S-scheme g-C₃N₄/TiO₂ heterostructure for tetracycline degradation and hydrogen production. Chinese Journal of Inorganic Chemistry, 2026, 42(4): 843-860. doi: 10.11862/CJIC.20250301
20. [20]
  Enqi Zhang , Fanyu Kong , Lina Dai , Xianglan Dong , Hongquan Jiang , Yanduo Liu , Yang Qu . Ni sites enhanced dual-Prussian blue analogs S-scheme photocatalyst for efficient CO₂ reduction. Chinese Chemical Letters, 2026, 37(10): 112479-. doi: 10.1016/j.cclet.2026.112479

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(49)
HTML views(0)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return