Department of Physics and Materials Science, ‡Materials Science Research Centre, and §Department of Chemistry, Faculty of Science, Chiang Mai University , Chiang Mai 50200, Thailand.
ACS Appl Mater Interfaces. 2012 Jul 25;4(7):3718-23. doi: 10.1021/am300812n. Epub 2012 Jul 12.
Preparation of bismuth vanadate and cerium dioxide (BiVO4/CeO2) nanocomposites as visible-light photocatalysts was successfully obtained by coupling a homogeneous precipitation method with hydrothermal techniques. The BiVO4/CeO2 nanocomposites with different mole ratios were synthesized and characterized by X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM). Absorption range and band gap energy, which are responsible for the observed photocatalyst behavior, were investigated by UV-vis diffuse reflectance (UV-vis DR) spectroscopy. Photocatalytic activities of the prepared samples were examined by studying the degradation of model dyes Methylene Blue, Methyl Orange, and a mixture of Methylene Blue and Methyl Orange solutions under visible-light irradiation (>400 nm). Results clearly show that the BiVO4/CeO2 nanocomposite in a 0.6:0.4 mol ratio exhibited the highest photocatalytic activity in dye wastewater treatment.
采用均相沉淀法与水热技术相结合，成功制备了钒酸铋/二氧化铈（BiVO4/CeO2）纳米复合材料，作为可见光光催化剂。通过 X 射线衍射（XRD）、拉曼光谱和透射电子显微镜（TEM）对不同摩尔比的 BiVO4/CeO2 纳米复合材料进行了表征。通过紫外-可见漫反射（UV-vis DR）光谱研究了吸收范围和带隙能，这些参数决定了观察到的光催化剂行为。通过在可见光（>400nm）照射下研究模型染料亚甲基蓝、甲基橙以及亚甲基蓝和甲基橙混合溶液的降解，考察了所制备样品的光催化活性。结果清楚地表明，在染料废水处理中，摩尔比为 0.6:0.4 的 BiVO4/CeO2 纳米复合材料表现出最高的光催化活性。
