钒酸铋/二氧化钛--石墨烯宽光谱复合光催化剂的制备及性能

Preparation and properties of BiVO_4/TiO_2-graphene composite photocatalysts with wide spectra

通过溶剂热法制备了具有可见光光催化活性的Bi VO4/Ti O2-石墨烯复合光催化剂.利用X射线粉末衍射、透射电子显微镜、紫外-可见漫反射光谱和荧光发射光谱对样品进行表征,复合光催化剂的催化活性以模拟太阳光条件下降解水溶液中亚甲基蓝来评价.结果表明：Bi VO4/Ti O2-石墨烯复合光催化剂在530-800 nm的可见光范围具有很强的吸收峰.石墨烯的引入不仅拓宽了光谱响应范围,而且使得Bi VO4和Ti O2粒子均匀地分散在石墨烯薄片上,能快速捕获并迁移电子,有效地提高了光生载流子的分离效率,从而提高其光催化活性.

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.