不同前驱体制备氮掺杂二氧化钛及其光催化性能比较

Preparation of nitrogen-doped titanium dioxide from different precursors and comparison of their photocatalytic performance

在氨气气氛中和不同温度下焙烧纳米管钛酸和商业Degussa-P25,得到两系列可见光响应型氮掺杂二氧化钛光催化剂.采用高分辨透射电子显微镜、紫外-可见漫反射光谱仪和X射线衍射仪对两系列样品的形貌、光谱吸收和晶体结构等物理化学性质进行了表征和比较.通过可见光光催化氧化丙烯评价系统对两系列样品的活性进行了评价.结果表明,600℃处理纳米管钛酸得到的催化剂可见光催化活性最好,是相同条件下处理Degussa-P25得到的催化剂(N-P25)活性的3.3倍.研究表明,纳米管钛酸是制备可见光响应型光催化剂较好的前驱体.

Two kinds of visible-light-response nitrogen-doped titanium dioxide were prepared by thermal treatment of nanotubular titanic acid or Degussa-P25in flowing NH3.The physicochemical properties of resultant nitrogen-doped TiO2samples were investigated by means of transmission electron microscopy,diffuse reectance spectrometry,and X-ray diffraction.The visible light photocatalytic activity of the two kinds of nitrogen-doped samples was compared by monitoring the photocatalytic oxidation of propylene.It was found that the samples obtained with NTA as the precursor under 600℃shows the highest photocatalytic activity which is about 3.3times of that of the samples prepared with Degussa-P25as the precursor under the same conditions.The present research demonstrates that nanotubular titanic acid is a more promising precursor for designing and preparing visible-light-active photocatalyst.