Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 1, Pages 389-398Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp409598s
Keywords
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Funding
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13096]
- National Natural Science Foundation of China [21076196, 21177115]
- Zhejiang Provincial Natural Science Foundation of China [LR13B070002]
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A novel visible-light-active BiOCl/BiVO4 photocatalyst with a p-n heterojunction structure was prepared using a hydrothermal method. The photocatalytic activity of the heterojunction was investigated by monitoring the change in methyl orange (MO) concentration under visible-light irradiation. The results reveal that the composite exhibited markedly improved efficiency for MO photodegradation in comparison with pure BiVO4, BiOCl, and Degussa P25. This is ascribed to the B-type heterojunction structure with a strong oxidative ability and efficient charge separation and transfer across the BiOCl/BiVO4 p-n junction. The highest activity was obtained in the BiOCl/BiVO4 heterojunction using a composite of 13 mol % BiOCl and 87 mol % BiVO4. The removal of MO was mainly initiated by valence-band holes, but dissolved oxygen also played a crucial role in consuming the conduction-band electrons. This was verified by the effects of scavengers and N-2 purging.
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