Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7833054 | Applied Surface Science | 2018 | 44 Pages |
Abstract
Herein, we demonstrate the design and fabrication of β-Bi2O3@Bi2S3 hollow microspheres with sheet-like hierarchical nanostructures targeting an advanced visible-light-responsive photocatalytic system. In comparison with pure Bi2S3 and β-Bi2O3, the as-obtained β-Bi2O3@Bi2S3 heterojunction photocatalyst exhibits a markedly enhanced sunlight photocatalytic activity towards the photo-degradation of rhodamine B. Following, the property of the β-Bi2O3@Bi2S3 on the Cr6+ photocatalytic reduction was then evaluated. Operating conditions such as β-Bi2O3@Bi2S3 mass, tartaric acid concentration, and initial Cr6+ concentration were analyzed. The results showed that a suitable reduction condition was selected as, β-Bi2O3@Bi2S3 dosage 25â¯mg, initial concentration 20â¯mg·Lâ1 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 β-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.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Chongfei Yu, Pengyan Yang, Luna Tie, Siyu Yang, Shuying Dong, Jingyu Sun, Jianhui Sun,