Bi2WO6/TiO2纳米带的制备及其可见光催化性能

Synthesis of Bi2WO6/TiO2 nanobelts for development of visible-light-driven photocatalysts and their photocatalytic properties

以TiO2 P25纳米颗粒为原料,通过碱-水热法制备TiO2纳米带,再采用水热法成功制备出Bi2WO6/TiO2纳米带材料.利用X射线衍射仪(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)以及透射电子显微镜(transmission electron microscope,TEM)分别对该材料的物相和形貌进行了分析,并研究了其在可见光下的光催化的性能和催化机理.研究结果表明:制备出的Bi2WO6纳米带通过分子间作用力成功负载在TiO2纳米带上.制备出的Bi2WO6/TiO2在可见光下具有优越的光催化性能,这归因于材料较好的光生电子-空穴分离效率以及材料特定的物理性质,不仅为光催化反应提供了丰富的活性位点,还有效促进了电子的轴向迁移率.

TiO2 P25 nanoparticles were used as raw materials to synthesise TiO2 nanobelts by the alkaline hydrothermal method.The Bi2 WO6/TiO2 nanobelts were successfully synthesised by the hydrothermal method using the TiO2 nanobelts.X-ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM)techniques were used to study the morphology and structure of the synthesised hybrid material.The experimental results revealed that the Bi2 WO6 nanosheets could be successfully loaded onto the surface of the TiO2 nanobelts(attachment via intermolecular interactions).The photocatalytic performance of the Bi2 WO6/TiO2 composite material and the mechanism of catalysis were investigated under visible light irradiation.The results showed that the prepared Bi2 WO6/TiO2 hybrid material had excellent photocatalytic properties.The enhanced photocatalytic activity could be attributed to the excellent photogenerated electron-hole pair separation(effective charge separation)and specificity of the composite material.The effective charge separation not only generated abundant active sites for photocatalytic reactions but also effectively promoted the axial mobility of electrons.