Synthesis,Characterization and Photocatalytic Activity of TiO₂ Film/Bi₂O₃ Microgrid Heterojunction

Liugang Wang 1),Junying Zhang 1),Chunzhi Li 1),Hailing Zhu 2),Wenwen Wang 1) and Tianmin Wang 1) 1) School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,China 2) Shandong Provincial Key Laboratory of Multi-photon Entanglement and Manipulation Department of Physics,Weifang College,Weifang 261061,China

摘 要：TiO2 film modified by Bi2O3 microgrid array was successfully fabricated by using a microsphere lithography method.The structure and morphology of TiO2 film,Bi2O3 film and TiO2 film/Bi2O3 microgrid heterojunction were characterized through X-ray diffraction,atomic force microscopy and scanning electron microscopy.The optical transmittance spectra and the photocatalytic degradation capacity of these samples to rhodamine B were determined via ultraviolet-visible spectroscopy.The results indicated that the coupled system showed higher photocatalytic activity than pure TiO2 and Bi2O3 films under xenon lamp irradiation.The enhancement of the photocatalytic activity was ascribed to the special structure,which could improve the separation of photo-generated electrons and holes,enlarge the surface area and extend the response range of TiO2 film from ultraviolet to visible region.

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