标题:
Zn掺杂TiO2的光催化性能研究Effect of Zn Doping on the Photocatalytic Activity of TiO2
作者:
余大凤, 刘浩, 鲍钰文, 高云, 夏晓红
关键字:
Zn掺杂TiO2, 溶胶凝胶法, 光催性能Zn Doped TiO2; Sol-Gel Method; Photocatalytical Activity
期刊名称:
《Hans Journal of Nanotechnology》, Vol.4 No.1, 2014-02-24
摘要:
以钛酸四丁酯为钛源，醋酸锌为锌源用溶胶凝胶法制备了不同比例Zn掺杂TiO2纳米颗粒，掺杂比例为0 at%~10 at%。用X射线衍射(XRD)、透射电镜(TEM)、能谱分析(EDS)、紫外可见光谱(UV-Vis)等研究手段对所制备的Zn掺杂TiO2纳米颗粒进行分析，并对样品的光催化活性进行了研究。结果显示400℃退火的样品均为锐钛矿相TiO2，没有ZnO的衍射峰出现，EDS分析结果显示Zn离子存在于TiO2中，说明Zn离子成功掺杂进入TiO2晶格。通过TEM图像和谢乐公式计算可知，Zn掺杂TiO2的平均晶粒尺寸为6~7 nm，掺杂比例为1%的样品光催化降解亚甲基蓝染料效果最好。
TiO2 nanocrystalline powders with various Zn doping levels from 0 at% to 10 at% were synthesized via sol-gel method with Tetrabutyl orthotitanate (TBOT) and zinc acetate as Ti and Zn source. The samples were characterized by XRD, TEM, EDS and diffuse absorption spectrum. The effect of Zn doping on optical and photocatalytical properties of TiO2 was systematically investigated. XRD results show that all the prepared powders were Anatase TiO2, no ZnO was found when the samples were annealed at 400˚C. EDS analysis confirmed the existence of Zn in the samples. It suggests that Zn was successfully doped into TiO2. Average particle size of the prepared Zn-TiO2 powders was about 6 - 7 nm obtained from TEM measurement and Scherer Equation calculation. The nano size powders were used to catalytically decompose methylene blue, and the sample doped with 1 at% Zn showed the best photocatalytic activity, better than that of pure TiO2.