Journal
APPLIED SURFACE SCIENCE
Volume 455, Issue -, Pages 8-17Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.04.201
Keywords
Hierarchical hollow microspheres; Heterojunction photocatalyst; Photocatalytic mechanism; Sunlight; beta-Bi2O3@Bi2S3
Categories
Funding
- NSFC [21677047, U1604137]
- Innovation Scientists and Technicians Troop Construction Projects
- Research Start-up Foundation [5101219170107]
- Key Scientific and Technological Projects in Henan Province [132102210129]
- Scientific Research Start-up Foundation from Soochow University [Q416000117]
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Herein, we demonstrate the design and fabrication of beta-Beta i(2)O(3)@Beta i(2)S(3) hollow microspheres with sheet-like hierarchical nanostructures targeting an advanced visible-light-responsive photocatalytic system. In comparison with pure Bi2S3 and beta-Bi2O3, the as-obtained beta-Beta i(2)O(3)@Bi2S3 heterojunction photocatalyst exhibits a markedly enhanced sunlight photocatalytic activity towards the photo-degradation of rhodamine B. Following, the property of the Bi2O3@Bi2S3 on the Cr6+ photocatalytic reduction was then evaluated. Operating conditions such as beta-Bi2O3@Bi2S3 mass, tartaric acid concentration, and initial Cr6+ concentration were analyzed. The results showed that a suitable reduction condition was selected as, beta-Bi2O3@Bi2S3 dosage 25 mg, initial concentration 20 mg.L and molar ratio of Cr6+/tartaric acid 1:20. The outstanding photocatalytic performances of the hybrid photocatalyst are mainly attributed to the reduced recombination rates of photo-generated electrons/holes, enhanced light harvesting, increased active sites as well as the improved photo/chemical stability. Moreover, the photocatalytic mechanism of beta-Bi2O3@Bi2S3 for oxidation of RhB and reduction of Cr6+ was investigated in detail. The enhanced photocatalytic activity and excellent chemical stability render the thus-fabricated heterostructure a promising candidate to remediate aquatic contaminants and meet the demands of future photocatalytic materials. (C) 2018 Elsevier B.V. All rights reserved.
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