钨酸铋与石墨烯纳米复合材料的制备及光催化性能

Preparation and Photocatalytic Properties of the Nanocomposite Material of Reduce Graphene Oxide with Flower-like Hollow Bi_(2)WO_(6)

利用溶剂热法,在乙二醇与水混合溶剂中制备了还原氧化石墨烯(RGO)上负载钨酸铋的光催化剂(Bi_(2)WO_(6)/RGO)。通过X射线衍射(XRD)、扫描电子显微镜(SEM)等对纯相Bi_(2)WO_(6)及Bi_(2)WO_(6)/RGO光催化剂的形貌、结构进行表征,证明Bi_(2)WO_(6)成功复合在RGO上,且Bi_(2)WO_(6)/RGO光催化剂的光谱吸收延伸至可见光。在可见光下,将纯相Bi_(2)WO_(6)及Bi_(2)WO_(6)/RGO分别对亚甲基蓝(MB)进行降解,结果表明,Bi_(2)WO_(6)/RGO与纯相Bi_(2)WO_(6)相比,表现出更好的光催化性能,可能与光生电子与空穴能够快速分离有关。在相同条件下,Bi_(2)WO_(6)/RGO对MB的降解率可达100%,而纯相Bi_(2)WO_(6)的降解率仅为75%,表明Bi_(2)WO_(6)/RGO复合材料是一种新型的具有高催化效率的光催化剂。

Bi_(2)WO_(6)/RGO photocatalyst by supported Bi_(2)WO_(6)on reduced graphene oxide(RGO)was prepared using solvothermal method in the mixed solvents of ethylene glycol and deionized water.The structure and morphology of pure Bi_(2)WO_(6)and Bi_(2)WO_(6)/RGO photocatalyst were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM).The results showed that Bi_(2)WO_(6)was successfully composited with RGO.UV-vis spectra showed that Bi_(2)WO_(6)/RGO photocatalyst had strong adsorption in the visible light region.The methylene blue(MB)pollutant was degraded by Bi_(2)WO_(6)and Bi_(2)WO_(6)/RGO photocatalyst under visible light.The results confirmed that Bi_(2)WO_(6)/RGO photocatalyst exhibited better photocatalytic activity than pure Bi_(2)WO_(6),which was attributed to accelerated separation of photo electron from holes.At the same conditions,the degradation ratio of MB catalyzed by Bi_(2)WO_(6)/RGO was high up to 100%and the MB degradation ratio catalyzed by the pure Bi_(2)WO_(6)was only 75%,which indicated that Bi_(2)WO_(6)/RGO composite material was a new type of photocatalyst with high catalytic efficiency.