中文摘要：

采用溶胶-凝胶法制备了Zr离子掺杂TiO2光催化剂．光催化降解对氯苯酚实验表明，Zr离子掺杂浓度为10％时活性最高，其紫外光、可见光催化活性分别是纯TiO2的1．5和4倍．利用XRD，XPS，UV—Vis漫反射吸收谱（diffuse reflectance absorption spectra），光致发光谱（photoluminescence）等技术对样品进行了表征，结果表明：Zr离子以取代式掺杂方式进入TiO2晶格，在TiO2导带下方形成掺杂能级，增强了可见光响应，促进了光生载流子的分离，此外Zr离子掺杂在催化剂表面引入大量表面缺陷，增加了表面羟基物种，从而使得Zr离子掺杂TiO2光催化剂的紫外、可见光催化活性显著提高．

英文摘要：

TiO2 photocatalysts doped by different contents of zirconium ions were prepared by a sol-gel method. The experiments of 4-chlorophenol photocatalytic degradation showed that the TiO2 with zirconium doped content at 10% exhibited the best photocatalytic activity. Its photocatalytic efficiency is 1.5 and 4 times as high as that of pure TiO2 under ultraviolet and visible light. The samples were characterized by XRD, XPS, UV-Vis diffuse reflectance absorption spectra and photoluminescence. It was revealed that zirconium ions substituted the lattice titanium ions in TiO2 lattice. And thus, the doping energy level attributed to the zirconium dopant was located at 0.3 eV below the conduction band of TiO2, which enhanced the response to the visible light and accelerated the separation of photogenerated carries. In addition, more surface defects and hydroxyls were present on the surface of zirconium doped TiO2. Consequently, the zirconium doped TiO2 showed improved photocatalytic activity for photodegradation of 4-chlorophenol compared to pure TiO2 under both UV and visible light irradiation.