采用水热法制备了铜修饰钒酸铋/膨润土(Cu-BiVO4/BTT)复合材料,借助X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和紫外-可见漫反射吸收光谱(DRS)对其进行表征。XRD分析显示,所制备的催化剂中BiVO4均保持单斜结构,SEM结果证实了钒酸铋负载到了膨润土上,XPS结果显示Cu元素以CuO形式存在于催化剂表面,DRS结果显示复合材料在可见光区域的吸收增强。研究表明,当Cu与Bi的摩尔比为1.2时,复合材料光催化活性最高,经可见光照射3h,对模型汽油脱硫率达91%。
Copper modified bismuth vanadate/bentonite(Cu-BiVO4/BTT) nanocomposites were hydrothermally synthesized,and characterized by X-ray diffraction(XRD),scanning electron microscopy (SEM),X-ray photoelectron spectroscopy (XPS),and UV-Vis diffuse reflectance spectroscopy (DRS).XRD showed that all the photocatalysts had the same single monoclinic sheelite structure.SEM results confirmed that BiVO4 was loaded to BTT.XPS results shown that Cu existed on the surface of the BiVO4 catalysts as their stable oxide cation species CuO.DRS results shown the absorption of nanocomposites was enhanced in the visible region.The highest desulfurization rate of model oil can reach 91% under the visible light irradiation for 3 h when the molar ratio of Cu to Bi was equal to 1.2.
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