【摘要】 以Bi(NO3)3·5H2O和NH4VO3为原料,采用水热法合成了BiVO4和TiO2/BiVO4复合光催化剂,借助XRD、SEM、UV-Vis、IR等测试手段对样品进行了表征。XRD分析表明,所得BiVO4为单斜晶系结构,与TiO2复合后,特征衍射峰窄化,强度略增;SEM显示,BiVO4样品呈现规整的多边立方体形貌,TiO2/BiVO4粉体为规整球状形貌。UV-Vis紫外可见光谱表明,BiVO4和TiO2/BiVO4在400~700nm的可见光区域对光响应。根据光吸收特性,选择亚甲基蓝为模拟污染物,考察了样品的光催化活性。结果表明,与BiVO4相比,TiO2/BiVO4具有更高的可见光催化降解活性,催化降解亚甲基蓝的降解率达到95.9%。更多还原

【Abstract】 Using Bi(NO3)3·5H2O and NH4VO3as raw materials,photocatalyst BiVO4and TiO2/BiVO4were synthesized by hydrothermal method,and characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),UV-Vis techniques and infrared spectroscopy(IR).The XRD result indicated that the as-synthesized belonged to monoclinic crystal system BiVO4and after compounding with TiO2the characteristic diffraction peaks were narrowed while the intensity increased.The SEM images displayed that BiVO4were presented regular multilateral cube morphology,TiO2/BiVO4as-prepared had regular globular structure system.UV-Vis absorption spectrum indicated that BiVO4and TiO2/BiVO4responsed to visible light 400-700nm region.Based on the properties of optical absorption,selecting methylene blue as a model pollutant,the photocatalytic activity of samples were investigated.The results showed that TiO2/BiVO4had a better visible light photocatalytic activity than that of pure BiVO4,the degradation rate of methylene blue reached 95.9%.更多还原