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为了提高TiO2的可见光光催化性能,以微米级聚苯乙烯微球为模板,钛酸四丁酯为前驱体,三乙胺为氮源,采用静电吸附自组装法制备了粒径为1.20μm、壳层的厚度约为30nm且球形形貌良好的氮掺杂TiO2中空复合微球,采用SEM、XPS、XRD和紫外-可见分光光度计研究了其结构及光催化性能。结果表明:氮进入TiO2晶格内取代了部分O并改变了晶格中Ti和O的化学状态,但对TiO2晶型结构没有明显影响;氮掺杂后的TiO2中空复合微球禁带宽度变窄,氮掺杂TiO2中空复合微球不仅在紫外区有较强的光吸收能力,在可见光区也表现出较强的光响应性,对甲基橙的光催化降解率较Degussa P25型纳米TiO2的明显增强。研究结果对TiO2在光催化领域的应用具有理论指导意义。
In order to improve the visible light photocatalytic activity of TiO 2, polystyrene microspheres as template, tetrabutyl titanate as precursor and triethylamine as nitrogen source were prepared by electrostatic adsorption and self-assembly method with particle size of 1.20 μm, The structure and photocatalytic activity of the hollow microspheres were investigated by SEM, XPS, XRD and UV-Vis spectrophotometer. The results showed that the substitution of nitrogen into TiO2 lattice changed the chemical state of Ti and O in the lattice, but had no obvious effect on the crystal structure of TiO2. The band gap of TiO2 hollow composite microspheres Narrow, nitrogen-doped TiO2 hollow composite microspheres not only in the ultraviolet region has a strong light absorption capacity in the visible light region also showed strong photoresponsive methyl orange photocatalytic degradation rate Degussa P25-type nano-TiO2 Significantly enhanced. The research results have theoretical significance for the application of TiO2 in the field of photocatalysis.