氮掺杂TiO_2纳米粉体的制备及其可见光催化性能  

Preparation and Visible Light Photocatalytic Activity of Nitrogen-doped Nano-TiO_2 Powders

作　　者：赵宏生[1] 郭子斌[1] 李自强[1] 张凯红[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《材料工程》2011年第3期16-19,90,共5页Journal of Materials Engineering

基　　金：清华大学基础研究基金资助项目(JCq2005045)

摘　　要：以钛酸四丁酯和尿素为原料,采用溶胶-凝胶法制备了TiO2凝胶前驱体,干燥后在不同温度下进行热处理得到氮掺杂TiO2纳米粉体;以XRD,XPS,UV-Vis DRS等方法对氮掺杂TiO2纳米粉体的晶相、成分和光学性能进行了分析。结果表明,氮元素在TiO2晶格中主要以间隙掺杂形式存在,随着热处理温度升高和时间延长,TiO2粉体中氮的掺杂量逐渐减少。与纯TiO2纳米粉体相比,氮掺杂样品的吸收边均发生明显红移,最大吸收边达到700nm。亚甲基蓝在可见光下的降解实验表明,氮掺杂产物具有良好的可见光催化活性。N-doped nano-TiO2（anatase） powders were prepared by calcining titania gel precursor at different temperatures.The gel precursor was obtained by improved sol-gel method using tetrabutyl titanate and urea as source.The samples were characterized and analyzed by XRD,XPS and UV-Vis diffuse reflectance spectroscopy（DRS）.The results show that nitrogen element is successfully introduced to titania crystal lattice,and the nitrogen content decreases with the increase in calcination temperature and time.UV-Vis diffuse reflectance spectroscopy（DRS） results indicate that all samples have a red shift,and the absorption band of the sample calcined at 400℃ for an hour shifted up to 700nm.The photodegradation of methylene blue shows that N-doped nano-TiO2 powders have high visible-light photocatalytic properties.

关 键 词：TIO2 氮掺杂 溶胶-凝胶法 可见光催化 

分 类 号：O626.41[理学—有机化学]