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釩酸鉍/二氧化鈦-石墨烯寬光譜復合光催化劑的制備及性能

Preparation and properties of BiVO4/TiO2-graphene composite photocatalysts with wide spectra

  • 摘要: 通過溶劑熱法制備了具有可見光光催化活性的BiVO4/TiO2-石墨烯復合光催化劑.利用X射線粉末衍射、透射電子顯微鏡、紫外-可見漫反射光譜和熒光發射光譜對樣品進行表征,復合光催化劑的催化活性以模擬太陽光條件下降解水溶液中亞甲基藍來評價.結果表明:BiVO4/TiO2-石墨烯復合光催化劑在530-800 nm的可見光范圍具有很強的吸收峰.石墨烯的引入不僅拓寬了光譜響應范圍,而且使得BiVO4和TiO2粒子均勻地分散在石墨烯薄片上,能快速捕獲并遷移電子,有效地提高了光生載流子的分離效率,從而提高其光催化活性.

     

    Abstract: BiVO4/TiO2-graphene(BiVO4/TiO2-GR) photocatalysts were prepared by a facile solvothermal method. The composite photocatalysts were characterized by X-ray diffraction,transmission electron microscopy,UV-Vis diffuse reflectance spectrometry,and photoluminescence spectrometry. The photocatalytic activity was evaluated by degradation of methylene blue(MB)under simulated sunlight irradiation. It is found that the composite photocatalysts have a strong absorption peak in the 530-800 nm range of visible light. The introduction of graphene not only enlarges the absorption range of visible light,but also makes BiVO4 and TiO2 particles disperse uniformly in graphene sheets,and can capture and transfer the photogenerated charges,leading to an efficient improvement in photocatalytic activity.

     

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