N掺杂TiO_2光催化剂的制备及性能研究

Study on Preparation and Properties of N-doped TiO_2 Photocatalyzer

采用溶胶-凝胶法制备锐钛矿型N掺杂TiO_2粉体,通过X射线衍射光谱(XRD)、红外光谱(FT-IR)、紫外/可见光漫反射吸收光谱(UV-vis)对粉体的性能进行表征。结果表明,N掺杂使TiO_2粉体的晶粒细化,禁带宽度减小,光谱吸收阈值波长向可见光区红移至550nm左右。光催化降解甲基橙的实验表明,N-TiO_2粉体在普通日光灯下对甲基橙的降解率明显优于纯TiO_2粉体。

N-doped TiO2 powders are prepared by using the sol-gel process method. The samples are characterized by the XRD, FT-IR and UV-vis. The results indicate that the grain size and the band gap of TiO2 are reduced by doping nitrogen, and the absorption threshold wavelength is red-shift to about 550nm. The photocatalytic activity of N- doped TiO2 samples is promoted compared with that of pure TiO2 ; the degradation of methyl orange is obviously enhanced under the visible light.