摘要：应用溶胶-凝胶法,以尿素和钛酸丁酯为原料制备前躯体,前躯体在500℃、焙烧3 h条件下制备不同浓度掺杂氮的TiO₂纳米粉体。采用X射线衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)、紫外可见光谱(UV-Vis)等分析手段对样品的物相、形貌、成分和吸光性能进行表征,并且以亚甲基蓝溶液为模拟污染物在阳光下进行光催化实验。结果表明:样品主要为锐钛矿相二氧化钛及少量的金红石型二氧化钛,颗粒粒径小于300 nm,有一定程度的团聚,样品中含有质量分数分别为0、2.99%、6.23%、11.38%的氮元素,氮掺杂样品的光谱吸收边缘红移至400470 nm。光催化实验表明:氮掺杂可以大大改善TiO₂在可见光波段的光催化性能。

关键词： 溶胶-凝胶法；掺杂；二氧化钛；光催化

Abstract：Using urea and tetrabutyl-titanate as raw materials， the precursors were prepared by sol-gel methods， then they were calcined for 3 h at the temperature of 500 ℃ . The TiO₂ nano-particles with different nitrogen doping concentrations were obtained. The phase， morphology， composition and spectral absorption properties of the powder were characterized and analyzed by XRD， SEM， EDS， UV-Vis etc. And the photocatalytic experiments carried out under sunlight with methylene-blue solution as simulate pollutant. The results showed that the samples were mainly anatase titanium dioxide with a small amount of rutile-type titanium dioxide. The particle sizes were less than 300 nm. The mass fractions of N in samples were 0， 2.99% ， 6.23% and 11.38% . The absorption spectra of nitrogen-doped samples shifted to 400~500 nm. The photo-catalytic experimental results showed that nitrogen doping greatly improved the catalytic properties of TiO₂ under sunlight. 

Keywords： sol-gel method； dope； titanium dioxide； photocatalysis