Fluorine doped SnO2 nano photocatalysts were successfully prepared by using solid-state reaction strategy,using stannous fluoride and solid peroxides as precursors.The structure characterization showed that the as prepared samples had nanocrystalline characteristics,and the XRD spectra showed broadened diffraction peaks,indicating that the material had very small grain size.Scanning electron microscope observation confirmed that the product was composed of nano particles with uniform size distribution.XPS analysis confirmed the successful doping of fluorine.The UV-Vis absorption spectra showed that fluorine doping significantly enhanced the absorption ability of the material in the visible region,and effectively reduced the band gap.Fluorescence spectrum analysis revealed that fluorine doping led to the increase of oxygen vacancy concentration,which improved the separation efficiency of photogenerated carriers.Fluorine doped SnO2 has higher photocurrent density and smaller electrochemical impedance spectrum.The photocatalytic experiment data showed that the optimal sample could completely degrade methyl orange dye after 100 minutes of visible light irradiation,8 minutes of ultraviolet light irradiation or 6 minutes of sunlight irradiation,respectively.Based on the experimental results,this study further discussed the photocatalytic mechanism of fluorine doped SnO2.
采用X射线衍射仪(D/MAX-2500PC)分析催化剂的晶体结构;使用傅里叶变换红外光谱仪(Nicolet iS20)检测催化剂的表面官能团;分别使用场发射扫描电子显微镜(ZEISS SUPRA 55)和透射电子显微镜(JEM2100F)观察样品的微观形貌;通过X射线光电子能谱仪(250XI)表征样品的表面化学状态;采用ASAP2460型氮吸附仪测定样品比表面积;使用紫外-可见分光光度计(UV3600)和荧光光谱仪(FLS980,激发波长325 nm)测样品品光学性能。
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