中文摘要：

为了研究光催化材料TiO2对隧道内汽车尾气的净化效果，首先采用溶胶-凝胶法制备纳米二氧化钛光催化剂，采用不同掺量的Fe3＋改性纳米TiO2，并在500℃焙烧得到样品，然后利用自制尾气净化设备进行净化试验，接着对其进行X衍射（XRD）测定和红外光谱（IR）分析。结果显示，掺杂Fe3＋能够同时捕获电子和空穴，从而降低电子空穴对的复合几率，提高纳米二氧化钛的光催化性能，弱紫外光条件下对CO、CO2、HC、NOx的净化效率比未掺杂的纳米TiO2分别能提高0．6％、0．6％、2．3％、8．2％。

英文摘要：

In order to reveal the gas purification efficiency of nano TiO2 in tunnel, the sol-gel method was em- ployed to prepare nanometer titanium dioxide photocatalyst modified by different dosage of Fe3＋. The gas purification efficiency of the samples was tested by the exhaust gas purification equipment, the modification of Fe3＋ on the gas purification efficiency of nano TiO2 was investigated by XRD and IR characterization. The results indicated that doping Fe3＋ can capture the electrons and holes, which can reduce the recombination probability of electron hole pairs and improve the photocatalytic performance of nano-TiO2. Compared with undoped nano TiO2, the purification efficiency improvement of nano TiO2 containing 0. 1 wt% Fe3＋ on NOx, HC, CO and CO2 can be up to 0. 6%, 0. 6%, 2.3% and 8. 2% respectively.