以偏钛酸浆料制备氮掺杂纳米二氧化钛及其可见光催化性能研究

Preparation of N-doped Nano-TiO_2 Photocatalyst Using Metatitanic Acid and Photocatalytic Performance under Visible Light Irradiation

以工业偏钛酸为前驱体、尿素为氮源,混合煅烧制备了不同氮含量的TiO2光催化剂(记为TiO2-xN-温度)。用傅里叶红外光谱(FT-IR)、X射线光电子能谱(XPS)、X射线衍射(XRD)、透射电子显微镜(TEM)、荧光光谱和紫外-可见光漫反射吸收光谱(UV-Vis/DRS)等对催化剂进行了表征。以亚甲基蓝为目标污染物,评价了样品的可见光光催化活性。结果表明,当催化剂中尿素与TiO2质量比为3∶1,煅烧温度为400℃(即TiO2-3N-400℃)时制得的样品活性最高。500 W的长弧氙灯照射4 h,对亚甲基蓝降解率达到93.9%。

TiO2doped with different content of N were prepared by mixed calcination using metatitanic acid as raw material and urea as nitrogen source. The as prepared TiO2were characterized by X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）,transmission electron microscope（TEM）. Fourier Transform Infrared Spectrometer,UV-vis spectrophotometer. Visible light photocatalytic activity of N-doped nano-TiO2was evaluated by methylene blue photodegradation. The results show that the photocatalytic activity of N-doped Nano-TiO2is remarkable when the ratio of urea and metatitanic acid is 3∶ 1,calcination temperature was 400 ℃. Irradiated by 500 W long arc xenon lamp,the degradation rate of MB reached 93. 9%.