纳米Bi_2O_3的制备及其可见光催化活性

Synthesis of Bi_2O_3 and its application for visible light photocatalysis

采用共沉淀法制备纳米Bi_2O_3,并将其应用于光催化,研究不同热处理温度下制备的Bi_2O_3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Bi_2O_3的形貌、结构、光学及光催化活性。结果表明:Bi_2O_3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Bi_2O_3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。

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 lightadsorption and low recombination of photo-induced charge carries.