以钛酸四丁酯为前驱体,利用溶胶-凝胶法制备了不同掺铁量的改性纳米二氧化钛光催化剂.用XRD与SEM技术表征了其结构特征,并以硝基苯为目标降解物,得出当铁含量为0.05%时,制得的二氧化钛样品的光催化活性最高.当硝基苯初始浓度为50 mg/L,pH为3,催化剂用量为1.2 g/L时,室温条件下,40 W紫外灯照射100 min时,去除率高达88%. Titanium tetrabutoxide was used as precursor to prepare the modified nano titanium dioxide photocatalyst with different iron content by sol-gel method. The structure characteristics were characterized by XRD and SEM. Nitrobenzene was used as the target degradation product The results showed that the photocatalytic activity of titanium dioxide samples prepared at 0.05% iron content was the highest.When the initial nitrobenzene concentration was 50 mg / L, the pH was 3 and the catalyst dosage was 1.2 g / L, , 40 W UV lamp irradiation 100 min, the removal rate of up to 88%.