论文部分内容阅读
以钛酸丁酯为前驱体,以尿素为氮源,采用溶胶-凝胶法制备了不同N含量的TiO2光催化剂(N-TiO2).通过X-射线衍射(XRD)、紫外-可见吸收光谱(UV-Vis)、分子荧光光谱(PL)、X-射线光电子能谱(XPS)等检测手段对其结构和物理性能进行了表征.结果表明,N的掺杂能抑制锐钛矿相TiO2向金红石相的转化,能将TiO2的吸收边波长拓宽到可见光区域,能加速光生电子-空穴对的分离,提高光催化活性.在以可见光为光源进行重铬酸钾的光催化还原和苯酚的光催化氧化反应中,9%N-TiO2-500表现出了最强的光催化活性,且在光催化活性的稳定性实验中,表现出良好的光催化活性的稳定性,能多次重复使用.
N-TiO2 with different content of N was prepared by sol-gel method using butyl titanate as precursor and urea as nitrogen source. X-ray diffraction (XRD), UV-Vis absorption spectra (UV-Vis), molecular fluorescence spectroscopy (PL) and X-ray photoelectron spectroscopy (XPS) were used to characterize the structure and physical properties of the samples. The transformation of rutile phase can broaden the absorption edge wavelength of TiO2 to the visible region, accelerate the separation of photogenerated electron-hole pairs and improve the photocatalytic activity.In the photocatalytic reduction of potassium dichromate and phenol by visible light In the photocatalytic oxidation reaction, 9% N-TiO2-500 showed the strongest photocatalytic activity, and showed good stability of photocatalytic activity in the stability experiment of photocatalytic activity, and could be reused repeatedly .