论文部分内容阅读
以三乙胺为氮源,采用层层自组装和高温煅烧方法制备球形形貌良好的N掺杂TiO2中空介孔微球(N-THS),使用XPS、XRD、UV-VisDRS等手段研究了煅烧温度对其结构和光催化性能的影响。结果表明,N进入TiO2晶格内取代了部分O元素并改变了晶格中Ti和O的化学状态;在400-600℃煅烧所得TiO2呈现锐钛矿相结构,将煅烧温度提高到700℃则出现向金红石相的转变,且TiO2的晶粒尺寸随着煅烧温度的提高而增大。N-THS在可见光区具有明显的吸收性能,吸收光谱带也发生了明显红移,对MO溶液均具有较好的降解效率;而随着煅烧温度的降低,可见光区吸收相应增强,降解效率提高,在400℃锻烧的N-THS经光照射80min后其降解率达到93.5%。
The N-doped TiO2 hollow mesoporous microspheres (N-THS) with spherical morphology were prepared by layer-by-layer self-assembly and high temperature calcination using triethylamine as nitrogen source. XPS, XRD, UV-VisDRS and other methods were used to study Effect of calcination temperature on its structure and photocatalytic activity. The results show that N enters into the TiO2 lattice to replace part of the O elements and changes the chemical state of Ti and O in the lattice. The TiO2 obtained after calcination at 400-600 ℃ has an anatase phase structure. When the calcination temperature is raised to 700 ℃ The transition to rutile phase occurred, and the grain size of TiO2 increased with the increase of calcination temperature. N-THS has obvious absorption in the visible region, red shift in the absorption band, and good degradation efficiency in MO solution. With the decrease of calcination temperature, the visible light absorption increases and the degradation efficiency increases The degradation rate of N-THS calcined at 400 ℃ for 80min was 93.5%.