采用溶胶凝胶法制备了氮掺杂的纳米二氧化钛(TiO_2)光催化剂,以甲基橙的光催化降解为探针反应,用氙灯模拟太阳光,评价了其光催化活性,运用XRD、UV-Vis DRS和XPS等技术对制备的TiO_2进行表征,结果表明,氙灯下,500℃焙烧所制备的N掺杂TiO_2(N500)具有最佳的光催化活性,该催化剂为纯锐钛矿型,氮的质量掺杂量为0.7%,对波长400~550nm的可见光有较强的吸收。 Nitrogen-doped TiO 2 photocatalyst was prepared by sol-gel method. The photocatalytic degradation of methyl orange was used as the probe reaction. The xenon lamp was used to simulate the sunlight and its photocatalytic activity was evaluated. Vis DRS and XPS were used to characterize the prepared TiO 2. The results showed that N-doped TiO 2 (N500) prepared by calcination at 500 ℃ had the best photocatalytic activity under xenon lamp. The catalyst was pure anatase, nitrogen Of the mass doping amount of 0.7%, the wavelength of 400 ~ 550nm visible light has a stronger absorption.