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以Nb2O5、Bi(NO3)3 5H2O为原料,采用共沉淀法制备了纳米Bi3NbO7光催化剂,通过X射线衍射、扫描电子显微镜、比表面积及孔径分析和紫外可见漫反射光谱对样品的结构和表面形貌进行了相关表征,并在可见光(λ>400nm)照射下考察样品降解孔雀绿的光催化活性。结果表明:焙烧温度低于400℃,或焙烧时间少于8h,均不能形成Bi3NbO7物相。在400℃焙烧8h,所制备的Bi3NbO7具有窄的禁带宽度(2.29eV),较大的比表面积(15.87m2/g)以及适宜的孔径(21.9 nm),可见光催化活性最好,150 min照射后孔雀绿几乎全部降解,优于商品P25和铌酸催化剂。
Nanocrystalline Bi3NbO7 photocatalysts were prepared by coprecipitation method using Nb2O5 and Bi (NO3) 3 5H2O as raw materials. The structure and surface morphology of the samples were characterized by X-ray diffraction, scanning electron microscopy, surface area and pore size analysis and UV-Vis diffuse reflectance spectroscopy The results showed that the degradation of malachite green photocatalytic activity of the sample under visible light (λ> 400nm) irradiation. The results show that the Bi3NbO7 phase can not be formed when the calcination temperature is lower than 400 ℃ or the calcination time is less than 8h. After calcined at 400 ℃ for 8h, the prepared Bi3NbO7 has a narrow bandgap (2.29eV), a large specific surface area (15.87m2 / g) and a suitable pore size (21.9 nm) with the best photocatalytic activity at 150 min After almost complete degradation of malachite green, better than the product P25 and niobate catalyst.