期刊
DALTON TRANSACTIONS
卷 46, 期 34, 页码 11451-11458出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7dt01581j
关键词
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资金
- National Natural Science Foundation of China [21471086, 91122012]
- Social Development Foundation of Ningbo [2014C50013]
- K. C. Wong Magna Fund in Ningbo University
To explore catalysts combining highly accessible specific surface areas with low recombination of the photo-induced electron-hole pairs, a novel SiO2@PDA@BiOBr composite photocatalyst with a hierarchical core-shell structure was prepared by a facile solvothermal method. The catalyst shows a superior performance on photodegradation of Rhodamine B under visible light irradiation, especially for SiO2@PDA-2@BiOBr with the reactant kinetics constant (k = 0.0487 min(-1)). The enhanced photocatalytic performance of SiO2@PDA-2@BiOBr was ascribed to the decreased band-gap, higher surface area, and effectively photo-generated electron-hole pairs by the introduction of polydopamine (PDA). In addition, the photocatalytic degradation is initiated by O-center dot(2)- derived from dye photosensitization and h(+) from the BiOBr. Cyclic experiments also indicate that the SiO2@PDA-2@BiOBr is reusable during the photodegradation process. The hierarchical core-shell SiO2@PDA@BiOBr photocatalyst will provide a theoretical model for the development of physical chemistry and structural properties of BiOBr-based composites to enhance the photocatalytic performances.
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