In Situ Fabrication of TiO2/(Bi2O3/Bi2O2.33) S-Scheme Heterojunction with Enhanced Bifunctional Photocatalysis for CO2 Reduction and Dye Removal
Dingming Peng, Lei Wang, Meihong Lu, Yating Meng, Meiyun Luo, Zhiyang Wang, Hongjie Wei, Kai Zhang, Dapeng Xu, Yumei QinAbstract
S-scheme heterojunctions enable efficient charge carrier separation while preserving strong redox ability, making them a research hotspot in photocatalysis. This work reports a simple and novel approach to prepare TiO2/(Bi2O3/Bi2O2.33) (TBBO) heterojunctions using Ti foil as precursors via a combined hydrothermal and calcination treatment. Photocatalytic tests demonstrate that the as-prepared TBBO catalysts exhibit significantly higher activity than pristine TiO2. TBBO-0.02 exhibits the best CO2 photoreduction performance and stability, achieving a CO generation rate of 152.5 μmol·g–1·h–1, due to its abundant oxygen vacancies and efficient S-scheme heterojunction interface. Furthermore, TBBO-0.02 also displays outstanding activity in the photodegradation of methylene blue (MB), with a degradation efficiency of 95% within 70 min. This work presents a new route for the green and facile preparation of highly efficient and stable S-scheme heterojunctions.