Abstract：Precipitation method was used to synthesize pure phaseγ-Bi₂O₃ and different concentration yttrium doping samples with NaOH as precipitant at different temperatures. X-ray diffraction characterization of the samples shows that the required reaction time shortened along with temperature increase and crystal structure of all samples are unchanged by introducing yttrium into lattice. The microstructure of the sample is characterized by scanning electron microscopy. It is found that all samples exhibite tetrahedral particles and yttrium doping increases particle aggregation degree. The sizes of small particles attached to tetrahedral surface become larger gradually with increment of doping concentration. Ultraviolet visible diffuse reflectance spectroscopy analysis indicates the forbidden band width narrowed due to yttrium doping. Selecting Rhodamine B as model pollutant and γ-Bi₂-xYxO₃ as photocatalyst, the degradation performance is enhanced with doping.

Keywords：γ-Bi₂O_3; Y doping; photocatalytic degradation