Fe^(3+)掺杂BiVO_4的制备及光催化降解甲基橙的研究

Preparation of Fe^(3+) Doped BiVO_4 and Photocatalytic Degradation of Methyl Orange

以水稻秆为模板,成功合成了Fe3+掺杂Bi VO4光催化剂,通过X-射线衍射分析、扫描电子显微镜和比表面积及孔径分析等对其进行了表征和分析。结果表明:制备的Fe3+掺杂Bi VO4样品均为单斜白钨矿型,掺杂后样品的颗粒变小,比表面积增大。以金钨灯作为可见光光源,通过降解甲基橙,考察了Fe3+掺杂量对Bi VO4可见光催化活性的影响规律以及催化剂投加量对光催化降解甲基橙的影响。与纯Bi VO4比较,Fe3+掺杂有效提高了Bi VO4的可见光催化活性,当掺杂量为6%时,样品的光催化效率最高,50 min内对甲基橙B的脱色率达到76%。当m(催化剂)∶m(甲基橙)为30时,对甲基橙溶液的脱色率能达到93%左右。

Fe^3＋ doped BiVO4 photocatalyst had been prepared by taking rice stem as template. Fe^3＋ doped BiVO4 samples were characterized and analyzed by XRD, SEM, specific surface area and pore size analysis. The results showed that the prepared samples were all belong to monoclinic scheelite type,sample particles became smaller and specific surface area became bigger after the Fe^3＋ doping. The influences of Fe^3＋ doping amount on BiVO4 visible light catalytic activity and the influences of catalyst dosage on methyl orange light catalytic degradation were investigated by methyl orange degradation which took metal tungsten lamp as visible light source. Compared with pure BiVO4,Fe^3＋ doping had improved the BiVO4 visible light catalytic activity effectively. When the doping amount was 6%, the decolorization rate for methyl orange B would reach to 76% within 50min,and when the mass ratio between catalyst and methyl orange was 30,the decolorization rate for methyl orange solution would reach to 93% around.