Abstract: Nano-N-doped TiO2 photocatalyst was prepared by Sol-Gel method at room temperature，using tetrabutyl titanate as raw material and urea as N source. The N/TiO2 photocatalyst was characterized by X-ray diffraction（XRD），TEM，UV-Vis DRS. The results show that the N doped extended the spectral response range of nano-TiO2 particles to the visible light region. The better process parameters are that：n(n-butyl titanate) ∶n(urea) of 1∶3 and calcinate time of 3.5 h at 400 ℃，under which nano-N/TiO2 is anatase phase and its average particle diameter is 13 nm. When the photodegradation of methyl orange，the optimal pH is 4.0，degradation rate of methyl orange can reach 70.5% after 3 h。

Key words: nano-titanium dioxide, nitrogen-dope, visible light, photocatalysis

摘要： 以钛酸四丁酯和乙醇为原料，尿素为氮源，室温下采用溶胶-凝胶法制备了氮掺杂的纳米TiO2粉末。采用XRD、TEM、UV-Vis DRS对样品进行了表征。结果表明：N掺杂使纳米TiO2的光谱响应范围拓展到可见光区。较佳制备条件是：n(钛酸四丁酯)∶n(尿素)为1∶3，400 ℃下煅烧3.5 h，所得样品为锐钛矿晶型，平均粒径为13 nm。光降解甲基橙实验中，溶液pH值为4.0时，降解率最大，反应3 h降解率可达70.5%。

关键词: 纳米二氧化钛, 氮掺杂, 可见光, 光催化