Al^(3+)掺杂对FeVO4光催化材料结构及性能的影响

Effect of Al Doping on the Structure and Performance of FeVO_(4) Photocatalytic Materials

为了进一步提高钒酸铁(FeVO_(4))的光催化活性,该研究采用水热法制备了非晶态Al^(3+)/FeVO_(4)光催化剂,通过X射线粉末衍射仪、紫外可见漫反射光谱仪、傅里叶变换红外光谱仪、荧光分光光度计及透射电子显微镜对所制备样品的形貌与性能进行表征和分析。在模拟太阳光照射下,通过光催化降解甲基橙(MO)考察掺杂Al^(3+)对FeVO_(4)光催化剂活性的影响。实验结果表明,掺杂的Al^(3+)通过增加活性位点的数量来提升光生电子-空穴对分离速率,从而提升了材料的光催化活性。当Al^(3+)的掺杂量为5%时,催化剂光催化活性表现为最佳,60 min内对MO的降解效率达到约90%,较纯FeVO_(4)提高45%左右。电子在整个光降解反应体系中起主导作用,贡献率约为72%。

In order to further improve the photocatalytic activity of ferric vanadate(FeVO_(4)),the amorphous Al^(3+)/FeVO_(4) photocatalysts were prepared by hydrothermal method,and the prepared samples were characterized and analyzed by X-ray powder diffractometer(XRD),UV-vis diffuse reflectance spectrometer(DRS),Fourier transform infrared spectrometer(FT-IR),fluorescence spectrophotometer(PL)and transmission electron microscope(TEM).The effect of Al^(3+)doping on the photocatalytic activity of FeVO_(4) was investigated by photocatalytic degradation of methyl orange(MO)under simulated sunlight.The experimental results showed that the doped Al^(3+)enhanced the separation rate of photo electron-hole pairs by increasing the number of active sites,thus enhancing the photocatalytic activity of the materials.When the doping amount of Al^(3+)was 5%,the photocatalytic activity of this catalyst was optimal and the degradation efficiency of MO reached about 90%within 60 min,which was about 45%higher than that of pure FeVO_(4).Electrons(e-)played a dominant role in the overall photodegradation reaction system,with a contribution of about 72%.