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106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 Ndoped 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 106cell/mL.
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