Bi/BiVO_4&Bi_4V_2O_(11)复合催化剂的制备及其光催化性能

Bi/BiVO_4&Bi_4V_2O_(11) Composite Catalysts: Preparation and Photocatalytic Performance

经由溶剂热反应、光辅助还原过程制备Bi/Bi VO_4&Bi_4V_2O_(11)纳米复合光催化材料。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、高分辨率透射电子显微镜(HRTEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)、N_2吸附-脱附等温线和光致发光(PL)等手段对该复合物进行表征。实验结果表明当金属Bi与BiVO_4&Bi_4V_2O_(11)的质量比值为0.8,可见光照射30 min时,Bi/BiVO_4&Bi_4V_2O_(11)复合催化剂对罗丹明B(RhB)的降解率可达95.6%。此外,Bi/BiVO_4&Bi_4V_2O_(11)对四环素(TC)的降解也表现出增强的光催化性能。Bi/BiVO_4&Bi_4V_2O_(11)复合材料提升的光催化性能可能归因于金属Bi的表面等离子体共振(SPR)效应、拓宽的可见光吸收范围和增大的比表面积。此外,提出了复合光催化剂可能的光催化机理。

The Bi/BiVO4&Bi4V2O11 nanocomposite photocatalytic material was prepared by solvothermal reaction and photo-assisted reduction process. The composites were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), X-ray photo-electron spectroscopy (XPS), ultraviolet visible diffuse reflection spectra (UV-Vis DRS), nitrogen absorption-desorption isotherms and photoluminescence (PL) methods. The experimental results show that when the mass ratio of metal Bi to BiVO4&Bi4V2O11 is 0.8 and the visible light was irradiated for 30 min, the degradation rate of rhodamine B (RhB) could reach 95.6% over Bi/BiVO4&Bi4V2O11 composite catalysts. Besides, Bi/BiVO4& Bi4V2O11 also exhibited enhanced photocatalytic properties for the degradation of tetracycline (TC). The enhanced photocatalytic performance of Bi/BiVO4&Bi4V2O11might be attributed to the surface plasmonic resonance (SPR) effect of metal Bi, the widened visible light absorption range and the increased specific surface area. In addition, the possible photocatalytic mechanism for composite photocatalysts was proposed.