摘要
以廉价的TiOSO4为原料，通过水解法制备正钛酸前驱体，然后向正钛酸前驱体中加入尿素作为氮源，经煅烧制备氮掺杂纳米TiO2，采用X射线衍射、紫外-可见吸收光谱和扫描电镜等方法对制备的样品进行了表征，研究了不同N／Ti配比、煅烧温度、TiO2浓度、细菌浓度对光催化杀菌的影响。结果表明，制备的样品均为锐钛晶型，氮掺杂使TiO2在可见光区的光吸收明显增强；煅烧温度和N／Ti配比对光催化杀菌效果影响显著；当TiO2的质量浓度为1．5g／L时杀菌效果最好；当细菌浓度低于10^6细胞／mL时，氮掺杂TiO2的杀菌率可达90％以上。
The nano-meter particle of TiO2 precursor is prepared by hydrolysis with industrial titanic solution, and then urea is added as the source of nitrification. The mixture is thermally treated to obtain N-doped TiO2. The phase of N- doped titanium dioxide is measured by X-ray diffraction（XRD）, the morphology is observed by scanning electron microscope （SEM） ,and the optical property is measured by UV-Vis absorption spectra. The effects of N/Ti ratio, calcination temperature, concentration of titanium dioxide and bacterial concentration on photo-catalytic sterilization performance are investigated. The results show that all catalysts are anatase, and the doping of nitrogen leads to an obvious increase in optical absorption intensity in the visible-light region. The calcination temperature and N/Ti ratio have significant influence on photo-catalytic sterilization,which is best at the concentration of titanium dioxide of 1.5g/L. The rate of sterilization of N-doped titanium dioxide can achieve 90% at the concentration of bacteria lower than 106 cell/mL.
基金
湖南省科技厅科技计划项目（2007CK3075）
关键词
氮掺杂
TIO2
光催化
杀菌
N-doped, titanium dioxide, photocatalysis, sterilization
