摘要：采用共沉淀法制备纳米Bi₂O₃, 并将其应用于光催化, 研究不同热处理温度下制备的Bi₂O₃的光催化降解甲基橙的活性。通过扫描电子显微镜、X射线衍射、紫外-可见吸收光谱和荧光光谱表征Bi₂O₃的形貌、结构、光学及光催化活性。结果表明:Bi₂O₃的光催化活性与热处理温度有关, 热处理温度为400℃时, 合成的Bi₂O₃在可见光照射180 min时, 对甲基橙的降解率达到86%。良好的可见光吸收和较低的光生载流子复合是获得优异光催化活性的主要原因。

关键词：Bi₂O₃；光催化；甲基橙

Abstract：A facile co-precipitation method followed by thermal treatment was used to prepare Bi₂O₃. The morphology, structure and photocatalytic activity of Bi₂O₃ were characterized by field-emission scanning electron microscopy, X-ray diffraction spectroscopy, UV-Vis absorption spectrophotometer and fluorescence spectrophotometer, respectively. The morphology and photocatalytic activity of Bi₂O₃ are relevant to the calcination temperature. Bi₂O₃ treated at 400 ℃ shows the best photocatalytic activity in the degradation of methyl orange (86%) . The excellent photocatalytic activity should be attributed to its good light adsorption and low recombination of photo-induced charge carries.

Keywords: Bi₂O₃；photocatalysis；methyl orange