水热法合成单斜晶相BiVO4及其可见光催化活性研究

Hydrothermal Synthesis and Photocatalytic Properties of Monoclinic Phase BiVO4 under Visible Light Irradation

以Bi（NO3）3·5H2O和V2O5作为铋源和钒源，水热合成法成功合成出枝晶状m—BiVO4，采用X射线粉末衍射（XRD）、扫描电子显微镜（SEM）、傅立叶变换红外光谱（FT—IR）和紫外一可见光谱（UV—Vis）等方法对样品进行了详细的理化性能表征，结果证明，合成的光催化剂是结晶良好的枝晶状m-BiVO4：m—BiVO4中心微米棒边缘光滑，粗细均匀，平均直径为500nm，长度范围为6—10μm；两侧分枝长度范围在5—8μm，平均直径为400nm。试验选用刚果红作为目标降解有机染料，研究m—BiVO4对其光降解活性，120min内刚果红的光降解率达到了90％。

m-BiVO4 dendritic microstructure has been successfully synthesized via a hydrothermal crystallization route using Bi （NO3）3·5H2O and V2O5 as the source of bismuth and vanadium,respectively. The obtained m-BiV04 powders were characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM）, Fourier transform infrared spec- troscopy （FT-IR） and ultraviolet-visible spectra （UV-Vis）. Experimental results indicate branches grow virtually perpen- dicular to the surface of the BiVO4 microrods cores. In general, the BiVO4 microrod backbones are very neat and straight with an average diameter of 500nm and lengths ranging from 6 to 10μ m, whereas the length of branches grown on the BiVO4 backbone ranges from 5 to 8μm and the diameter of about 400nm. Using Congo red as degradation of organic dyes, the photodegradation activity of BiVO4 was investigated.The experimental results show that the highest degradation rate of Congo red can reach 90% for 120min.