Solvothermal synthesis of Ce-doped tungsten oxide nanostructures as visible-light-driven photocatalysts
Solvothermal synthesis of Ce-doped tungsten oxide nanostructures as visible-light-driven photocatalysts
复制标题
DOI：
10.1088/0957-4484/22/26/265603
复制
发表时间：
2011-07-01
期刊：
影响因子：
3.5
通讯作者：
Yin, Yansheng
中科院分区：
文献类型：
--
作者：
Chang, Xueting;Sun, Shibin;Yin, Yansheng
以氯化铈和六氯化钨为前驱体，用简单的溶剂热法制备了Ce(Ce)掺杂的氧化钨纳米结构。用电子显微镜、X射线衍射仪和X射线光电子能谱对所合成的样品进行了表征。在可见光照射下，通过降解水溶液中的甲基橙来评价样品的光催化活性。结果表明，随着W/Ce摩尔比的减小，样品的形貌经历了从一维束状纳米线经过更直、更短、更粗的束状纳米棒到二维束状块，再到束状纳米棒和团聚纳米粒子的混合物，最后到颗粒团聚的过程。与未掺杂的氧化钨相比，掺Ce的氧化钨具有更好的光催化活性。以W/Ce摩尔比为15：1合成的Ce掺杂氧化钨束块具有最好的光催化活性。这些新型纳米材料可能作为可见光驱动的光催化剂具有潜在的应用前景。
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.