The metastable γ-Bi_2O_3 photocatalysts with different morphologies were fabricated by means of a chemical precipitation method.The microstructure of as-prepared samples was characterized by X-ray diffraction,transmission electron microscopy and ultraviolet-visible diffusion reflectance spectroscopy.The photocatalytic performance of Bi_2O_3 powder was evaluated using rhodamine B as a model pollutant under visible light irradiation.The visible light photocatalytic activity of Bi_2O_3 with different morphologies is as follows,nanorod > nanorod/nanoflake > N doped TiO_2 > irregular particle > agglomerated particle.The γ-Bi_2O_3 shows the best photocatalytic performance and it can effectively degrade 97%RhB within 60 min.
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