中文摘要：

采用溶胶-凝胶法和四丁基氢氧化铵（TBAH）表面改性的方法制备出改性TiO2光催化剂（TBAH-TiO2）.利用X射线衍射谱（XRD）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）和表面光电压谱（SPS）等表征了催化剂的晶体结构、晶粒粒径和能带结构,并研究了其光催化活性.研究结果表明,TBAH-TiO2催化剂的表面主要存在NOx（x=1,2,3）物种,该物种能级（价带上0.20eV）产生了可见光响应,有效地促进了光生电子和光生空穴的分离,使催化剂的可见和紫外光催化活性显著提高,TBAH-TiO2催化剂降解对氯苯酚的可见光和紫外光催化活性分别是TiO2的2.6倍和1.7倍.

英文摘要：

Tetrabutyl ammonium hydroxide modified TiO： photocatalyst（TBAH-TiO2） was prepared by a sol- gel method and surface modification method with tetrabutyl ammonium hydroxide （TBAH）. The structure, crystallite size and energy levels of the photocatalysts were studied by X-ray diffraction（XRD）, X-ray photoe- lectron spectroscopy （ XPS ）, transmission electron microscopy （ TEM ）, Fourier transform infrared （ FTIR ） spectroscopy and surface photovoltaic spectroscopy （SPS）. The experimental results of 4-chlorophenol photo- catalytic degradation showed that TBAH-TiO： exhibited a better photocatalytic activity than TiO2. Its photocat- alytic efficiency is 2. 6 and 1.7 times as high as that of pure TiO2 under visible light and ultraviolet light, re- spectively. The results reveal that NOx（x = 1, 2 and 3 ） species that exist on the surface of the TBAH-TiO2 catalyst introduce the energy level of surface states 0. 20 eV above the valence band. This energy level not only makes the catalyst responsible to visible light but also promotes the separation of photogenerated carriers. Thus, the activities under ultraiolet light and visible light irradiations are increased.