Enhanced photocatalytic activity of direct Z-scheme Bi2O3/g-C3N4 composites via facile one-step fabrication

Coupling oxidation type semiconductors is a feasible strategy to improve the photocatalytic activity of reduction type g-C3N4 photocatalysts. In this work, Bi2O3 was used as an oxidation type semiconductor to construct direct Z-scheme Bi2O3/g-C3N4 photocatalysts by a one-step calcination method. The...

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Bibliographic Details
Published in:Journal of materials research 2018-05, Vol.33 (10), p.1391-1400
Main Authors: Liu, Shuilian, Chen, Jianlin, Xu, Difa, Zhang, Xiangchao, Shen, Mengyao
Format: Article
Language:English
Subjects:
Adsorption
Applied and Technical Physics
Biomaterials
Bismuth oxides
Bismuth trioxide
Carbon nitride
Catalytic activity
Charge efficiency
Composite materials
Electron microscopes
Fourier transforms
Heterojunctions
Inorganic Chemistry
Light
Light irradiation
Materials Engineering
Materials research
Materials Science
Methylene blue
Microscopy
Nanotechnology
Nitrates
Oxidation
Photocatalysis
Photocatalysts
Photodegradation
Pollutants
Semiconductors
Spectrum analysis
Weight reduction
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Summary:Coupling oxidation type semiconductors is a feasible strategy to improve the photocatalytic activity of reduction type g-C3N4 photocatalysts. In this work, Bi2O3 was used as an oxidation type semiconductor to construct direct Z-scheme Bi2O3/g-C3N4 photocatalysts by a one-step calcination method. The obtained Bi2O3/g-C3N4 composites exhibited excellent photocatalytic activity and stability toward methylene blue degradation under visible light irradiation. The composite with 1% weight content of Bi2O3 to g-C3N4 exhibited the highest photocatalytic activity with an apparent rate constant of 0.063 min−1, which was 3.0 and 3.7 times higher than that of pure Bi2O3 and g-C3N4, respectively. The enhanced photocatalytic activity of the Bi2O3/g-C3N4 composite was mainly attributed to the improved charge separation efficiency and stronger redox ability. This work gave a new insight in developing g-C3N4-based Z-scheme heterojunction photocatalysts with enhanced photocatalytic activity.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2018.67