An α-Bi2O3/BiOBr core-shell heterojunction with high photocatalytic activity

We prepared an alpha-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 alpha-Bi2O3/BiOBr by SEM and TEM. The results revealed that the prepared alpha-Bi2O3/BiOBr photo-catalysts were porous, and their specific surface areas were found to be raised on comparing with alpha-Bi2O3 and BiOBr. In our experiments, the photocatalytic activity of alpha-Bi2O3 was obviously enhanced when assembling with ultrathin BiOBr compared with alpha-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 alpha-Bi2O3/BiOBr. The suitable band alignment (between alpha-Bi2O3 and BiOBr) and oxygen vacancy effect can be attributed to the increased photocatalytic activity under visible irradiation.