摘要
为拓展二氧化钛对可见光的响应,以尿素为氮源,在温和条件下采用溶胶-凝胶法制备了氮掺杂二氧化钛粉末.用X射线衍射、透射电镜扫描、紫外-可见光漫反射吸收光谱和X射线光电子能谱等方法对制备的样品进行了表征,对可见光照射下的光催化活性进行了测试,并考察了煅烧温度及氮含量对光催化活性的影响.结果表明:氮掺杂致使二氧化钛在可见光区的光吸收增强,在降解甲基橙的实验中表现出良好的可见光催化活性;随煅烧温度的增加,氮含量减少,晶粒增大,可见光催化活性减弱;400℃下制备的样品中存在一个最佳的N/Ti配比,所对应的可见光催化活性最高.
In order to expand the optical response of titania into the visible-light region, nitrogen-doped titania powders with urea as the nitrogen source were prepared by sol-gel method in mild conditions. The prepared samples were then characterized using XRD, TEM, UV-Vis diffuse reflectance spectrophotometer and X-ray photoelectron spectroscopy. Moreover, the photocatalytic activities of the samples in the visible-light region were tested, and the influences of calcination temperature and nitrogen content on the photocatalytic activity were investigated. The results indicate that （ 1 ） the doping of nitrogen leads to an increase in optical absorption intensity in the visible-light region, which results in a high visible-light photocatalytic activity with nitrogen-doped titania in the decolouration of methyl orange; （2） with the increase in calcination temperature, the nitrogen content decreases, the crystaUite size enlarges , and the visible-light photocatalytic activity weakens; and （3） there exists an optimum N/Ti proportion for the catalysts calcined at 400 ℃, which results in the highest visible-light photoctalytic activity.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第12期78-82,共5页
Journal of South China University of Technology(Natural Science Edition)
关键词
二氧化钛
光催化
氮掺杂
可见光
titania
photocatalysis
nitrogen doping
visible light
