炭吸附共沉淀钒酸铋纳米粉体的制备及其光催化性能研究

Preparation and Photocatalytic Properties of BiVO4 Nano Powders by Carbon Adsorption Coprecipitation Method

通过炭吸附共沉淀法制备钒酸铋纳米粉体,并对粉体的相关物理化学特性进行表征,表征方法包括透射电镜(TEM),X射线衍射仪(XRD),比表面积(BET),紫外可见分光光度计(UV-Vis),红外光谱(FT-IR)和热重分析仪(TG-DTG);利用甲基橙(MO)作为目标降解物,以500 W镝灯为可见光源,进行BiVO4光催化性能研究。结果表明,炭吸附共沉淀法制得的BiVO4粉体较普通沉淀法制得的粉体具有分布均匀且较分散、粒径小、团聚少等优点;同时600℃煅烧所得粉体光吸收波长较其他温度下发生红移,使得在可见光范围吸收能力增强;光催化降解甲基橙降解率在120 min内可达96%。

BiVO4 nanopowders was synthesized by carbon adsorption coprecipitation method.Its physical and chemical properties were characterized by transmission electron microscopy(TEM),X-ray diffraction(XRD),specific surface area(BET),ultraviolet visible spectrophotometer(UV-Vis),infrared spectroscopy(FT-IR)and thermogravimetric analyzer(TG-DTG),respectively.The photocatalytic property of prepared samples was investigated using methyl orange(MO)as pollutant and 500 W dysprosium lamp as light source.The results show that BiVO4 powders prepared by carbon adsorption coprecipitation method has the advantages of uniform distribution,smaller particle size and less agglomeration compared with the powders prepared by ordinary precipitation method.Meanwhile,the light absorption wavelength of the powder calcined at 600℃was red-shifted compared with other temperatures,which enhanced the absorption capacity in the visible light range.The photodegradation of methyl orange results show that the degradation rate of BiVO4 powder prepared by carbon adsorption coprecipitation method was 96%within 120 min.