Citation: Quan Xie, Wanmei He, Shengwei Liu, Chuanhao Li, Jinfeng Zhang, Po Keung Wong. Bifunctional S-scheme g-C₃N₄/Bi/BiVO₄ hybrid photocatalysts toward artificial carbon cycling[J]. Chinese Journal of Catalysis, ;2020, 41(1): 140-153. doi: S1872-2067(19)63481-9 shu

Bifunctional S-scheme g-C₃N₄/Bi/BiVO₄ hybrid photocatalysts toward artificial carbon cycling

a School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510006, Guangdong, China;
b College of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, Anhui, China;
c School of Life Sciences, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China;
d Institute of Environmental Health and Pollution Control, School of Environmental Science & Engineering, Gunagdong University of Technology, Guangzhou 510006, Guangdong, China

Received Date: 28 June 2019
Revised Date: 22 July 2019

Fund Project: This study is financially supported by the National Natural Science Foundation of China (51872341, 51572209), the Start-up Funds for High-Level Talents of Sun Yat-sen University (38000-31131105), the Fundamental Research Funds for the Central Universities (19lgzd29), and the Science and Technology Program of Guangzhou (201707010095).

Although both the aerobic photocatalytic oxidation of organic pollutants into CO₂ and the anaerobic photocatalytic reduction of CO₂ into solar fuels have been intensively studied, few efforts have been devoted to combining these carbon-involved photocatalytic oxidation-reduction processes together, by which an artificial photocatalytic carbon cycling process can be established. The key challenge lies in the exploitation of efficient bifunctional photocatalysts, capable of triggering both aerobic oxidation and anaerobic reduction reactions. In this work, a bifunctional ternary g-C₃N₄/Bi/BiVO₄ hybrid photocatalyst is successfully constructed, which not only demonstrates superior aerobic photocatalytic oxidation performance in degrading an organic pollutant (using the dye, Rhodamine B as a model), but also exhibits impressive photocatalytic CO₂ reduction performance under anaerobic conditions. Moreover, a direct conversion of Rhodamine B to solar fuels in a one-pot anaerobic reactor can be achieved with the as-prepared ternary g-C₃N₄/Bi/BiVO₄ hybrid photocatalyst. The excellent bifunctional photocatalytic performance of the g-C₃N₄/Bi/BiVO₄ photocatalyst is associated with the formation of efficient S-scheme hybrid junctions, which contribute to promoting the appropriate charge dynamics, and sustaining favorable charge potentials. The formation of the S-scheme heterojunction is supported by scavenger studies and density functional theory calculations. Moreover, the in-situ formed plasmonic metallic Bi nanoparticles in the S-scheme hybrid g-C₃N₄/Bi/BiVO₄ photocatalyst enhances vectorial interfacial electron transfer. This novel bifunctional S-scheme g-C₃N₄/Bi/BiVO₄ hybrid photocatalyst system provides new insights for the further development of an integrated aerobic-anaerobic reaction system for photocatalytic carbon cycling.
- S-scheme,
- Plasmonic Bi nanoparticles,
- Photocatalytic CO₂ reduction,
- Photocatalytic degradation of organic pollutants,
- Carbon cycling
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Bifunctional S-scheme g-C₃N₄/Bi/BiVO₄ hybrid photocatalysts toward artificial carbon cycling