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采用一步水热法制备Bi2MoO6/BiVO4复合光催化剂.利用X射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、高分辨透射电子显微镜(HRTEM)等手段对其晶体结构和微观结构进行了表征.结果表明,Bi2MoO6纳米粒子沉积在BiVO4纳米片表面从而形成异质结结构.紫外-可见漫反射光谱(UV-Vis DRS)表明所制备的Bi2MoO6/BiVO4异质结较纯相Bi2MoO6和BiVO4对可见光吸收更强.由于形成异质结结构及其光吸收性能使Bi2MoO6/BiVO4光催化活性有较大提高.可见光下(λ>420 nm)光催化降解罗丹明B(RhB)实验结果表明,Bi2MoO6/BiVO4光催化活性较纯相Bi2MoO6和BiVO4高.Bi2MoO6/BiVO4样品光催化性能提高的原因是Bi2MoO6和BiVO4形成异质结,从而有效抑制光生电子-空穴对的复合,增大了可见光吸收范围及比表面积.
The Bi2MoO6 / BiVO4 composite photocatalyst was prepared by one-step hydrothermal method and its crystal structure and microstructure were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy .The results showed that Bi2MoO6 nanoparticles were deposited on the surface of BiVO4 nanosheets to form heterojunction structures.The UV-Vis DRS spectra showed that the prepared Bi2MoO6 / BiVO4 heterostructures were more sensitive to visible light than pure Bi2MoO6 and BiVO4 And the absorption is stronger.The photocatalytic activity of Bi2MoO6 / BiVO4 is greatly enhanced by the formation of heterostructure and its light absorption properties.The results of photocatalytic degradation of RhB in visible light (λ> 420 nm) show that Bi2MoO6 / The photocatalytic activity of BiVO4 is higher than that of pure Bi2MoO6 and BiVO4.The reason for the increase of photocatalytic activity of Bi2MoO6 / BiVO4 samples is that Bi2MoO6 and BiVO4 form heterojunction so that the recombination of photogenerated electron-hole pairs can be effectively inhibited and the visible absorption range Specific surface area.