摘要
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.
基金
国家自然科学基金(50862009)
云南省自然科学基金(2005E0007M)
云南大学本科生科研立项基金(ynu2007044)
关键词
N掺杂
TIO2
光催化
可见光响应
nitrogen doping, TiO2, photocatalytic, visible light-responding