溶胶-凝胶法制备掺杂纳米 TiO2粉末及其光催化性能

摘要

Zn, N-doped and Zn-N-codoped nano TiO2 particles were prepared by sol-gel process. The phase composition, surface morphologies, optical properties and photocatalytic activity of the particles were characterized by X-ray diffraction, field emission scanning electron microscope, transmission electron miscroscopy, Fourier transform infrared spectroscopy tester and UV- visible-spectrophotometer, respectively. The results show that, nano-TiO2 doped with zinc or nitrogen neither change the crystal structure nor generate a new phase. Both N-doped TiO2 and Zn-doped TiO2 powders show higher photocatalytic activity compare to that of pure TiO2 particles. However, it is the opposite for the Zn-N codoped TiO2 powers. When the doping amount is 1% and the heat treatment temperature is 500 ℃, N-doped nano TiO2 particles exhibit the best photocatalytic activity.%　　采用溶胶–凝胶法制备掺锌纳米 TiO2粉末、掺氮纳米 TiO2粉末以及锌氮共掺纳米 TiO2粉末(掺杂量均为1%)。采用 X 射线衍射仪(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、傅立叶红外光谱测试仪及紫外可见–分光光度计等分析粉末的物相、形貌、光学性能及光催化性能。结果表明：在纳米 TiO2粉末中掺锌或氮，既不会改变粉末的晶体结构，也不会产生新相。与纯 TiO2粉末相比，掺锌或掺氮后粉末光催化性能更好。但同时掺入锌和氮，反而会降低 TiO2粉末的光催化性。在热处理温度为500℃条件下制备的掺氮 TiO2粉末光催化活性最高。