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用溶胶 凝胶法制备了复合半导体MoO3 TiO2 ,并用等体积浸渍法制备了Cu/MoO3 TiO2 光催化剂 .利用X射线衍射、激光拉曼光谱、程序升温还原、红外光谱、透射电镜和紫外 可见漫反射光谱等技术研究了所得光催化剂的物相结构、微粒尺寸和吸光性能 .结果表明 ,MoO3 含量为 10 %时呈单分子层分散在TiO2 上 ,催化剂的平均粒径为 10nm .MoO3 的引入使TiO2的吸收限发生明显的蓝移 ,MoO3 负载量超过 10 %时 ,有体相MoO3 生成 ,其光吸收性能下降 .Mo O Ti键的形成加强了半导体之间的相互作用 ,有利于光生载流子在半导体间的传输 .负载金属Cu可促进四面体配位Mo向八面体配位Mo转化 .
The composite semiconductor MoO3 TiO2 was prepared by the sol-gel method and the Cu / MoO3 TiO2 photocatalyst was prepared by the same volume impregnation method.Using X-ray diffraction, laser Raman spectroscopy, temperature programmed reduction, infrared spectroscopy, transmission electron microscopy and UV-visible diffuse reflectance Spectroscopy and other techniques to study the phase structure of the resulting photocatalyst, particle size and absorption properties of the results show that the MoO3 content of 10% was monolayer dispersed in TiO2, the average particle size of the catalyst was 10nm. MoO3 the introduction of TiO2 The absorption band of the MoO3 is obviously blue-shifted, and when the MoO3 loading is more than 10%, the bulk MoO3 is formed and its optical absorption properties decrease. The formation of Mo O Ti bonds strengthens the interaction between the semiconductors and is favorable for photo-generated carriers Transfer between semiconductors. Metallic Cu promoted the coordination tetrahedrally coordinated Mo to octahedral coordinated Mo.