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Published on: March 29, 2019
An α-Bi2O3/BiOBr core-shell heterojunction with high photocatalytic activity
Lianwei Shan1, Yuteng Liu1, Hongtao Chen1
1College of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China. Shlw0531@163.com.
Abstract:
We prepared an α-Bi2O3/BiOBr core-shell heterojunction via a facile in situ chemical transformation method. Ultrathin BiOBr nanosheets were observed and these were found to be evenly distributed on the surface of α-Bi2O3/BiOBr by SEM and TEM. The results revealed that the prepared α-Bi2O3/BiOBr photocatalysts were porous, and their specific surface areas were found to be raised on comparing with α-Bi2O3 and BiOBr. In our experiments, the photocatalytic activity of α-Bi2O3 was obviously enhanced when assembling with ultrathin BiOBr compared with α-Bi2O3/BiOBr and the individual phase. It is considered that the surface porous structure increases the specific surface areas, which improved the adsorption characteristics of α-Bi2O3/BiOBr. The suitable band alignment (between α-Bi2O3 and BiOBr) and oxygen vacancy effect can be attributed to the increased photocatalytic activity under visible irradiation.
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