Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai, People's Republic of China.
Nanotechnology. 2011 Jul 1;22(26):265603. doi: 10.1088/0957-4484/22/26/265603. Epub 2011 May 17.
Cerium (Ce)-doped tungsten oxide nanostructures have been generated by using a simple solvothermal method with cerium chloride salts and tungsten hexachloride as precursors. The as-synthesized samples were characterized by electron microscopy, x-ray diffraction and x-ray photoelectron spectrometry. The photocatalytic activities of the samples were evaluated by degradation of methyl orange in an aqueous solution under visible light irradiation. Results showed that the as-synthesized samples underwent morphological evolution with decreasing W/Ce molar ratio, from one-dimensional bundled nanowires through straighter, shorter and thicker bundled nanorods to two-dimensional bundled blocks, then to a mixture of bundled nanorods and agglomerated nanoparticles, and finally to particle agglomerates. The Ce-doped tungsten oxides exhibited better photocatalytic activities than that of the undoped tungsten oxide. The cerium-doped tungsten oxide bundled blocks synthesized with a W/Ce molar ratio of 15:1 possessed the most effective photocatalytic activity among the tested samples. These novel nanomaterials may find potential applications as visible-light-driven photocatalysts.
采用简单的溶剂热法，以氯化铈盐和六氯化钨为前驱体，制备了铈掺杂氧化钨纳米结构。通过电子显微镜、X 射线衍射和 X 射线光电子能谱对合成的样品进行了表征。通过在可见光照射下降解水溶液中的甲基橙来评估样品的光催化活性。结果表明，随着 W/Ce 摩尔比的降低，合成样品经历了形态演变，从一维束状纳米线到更直、更短、更厚的束状纳米棒，再到二维束状块，然后到束状纳米棒和团聚纳米颗粒的混合物，最后到颗粒团聚体。铈掺杂氧化钨表现出比未掺杂氧化钨更好的光催化活性。在测试的样品中，W/Ce 摩尔比为 15:1 时合成的铈掺杂氧化钨束状块具有最高的光催化活性。这些新型纳米材料可能作为可见光驱动的光催化剂有潜在的应用。
