摘要
采用溶胶-微波法制备了稀土元素Dy掺杂的纳米TiO_2复合粉体,采用XRD、拉曼、XPS等手段对样品进行了表征和分析,并以甲基橙的光催化降解为探针反应,探讨稀土Dy掺杂对纳米TiO_2的相变及光催化活性的影响。研究结果表明:稀土掺量为1.3%、经550℃煅烧后制备的样品光催化活性显著提高,对甲基橙的降解率为92%。与未掺杂纳米TiO_2相比,稀土Dy掺杂可以阻碍纳米TiO_2晶粒的生长,增大了比表面积;提高其热稳定性,抑制TiO_2锐钛矿相向金红石相转变;并使TiO_2产生晶格缺陷从而增加纳米TiO_2粉体表面羟基含量和表面氧空位,抑制了光生电子和空穴的复合,增强纳米TiO_2的光催化活性。
The TiO2 photocatalyst doped lyzed by XRD, Raman, XPS, et al. The effects with dysprosium were prepared by sol-microwave method, and ana- of Dy-doping on phase transition and photocatalytic properties of the nano TiO2 photoeatalyst was evaluated by the photocatalytic degradation of methyl orange. The results showed that the samples whose rare earth content is 1.3% and calcination temperature is 550 ℃ has significantly improved photocatalytic activity, and the degradation rate of methyl orange is 92%. Compared with the un-doped TiO2, the doping of Dy inhibited the grain growth and then increased the specific surface area; and enhance the thermal stability which can inhibited the TiO2 phase transformation from anatase to rutile. At the same time, nano TiO2 form the lattice defects which increase the surface hydroxyl content and the surface oxygen vacancies, and inhibit the recombination of photogenerated electrons and holes, then the photocatalytic activity of nano TiO2 was enhanced.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第22期6-10,共5页
Materials Reports
基金
陕西省自然科学基础研究计划项目(2014JM2035)
"十二五"国家科技支撑计划项目(2013BAJ01B02)
关键词
溶胶-微波法
Dy掺杂
甲基橙
光催化降解
sol-microwave method, Dy-doping, methyl orange, photocatalytic degradation
