摘要
采用微波辅助胶溶工艺,在常压条件下,制备了可用于室内杀菌的铁、铈共掺杂纳米TiO2水溶胶,通过X-射线衍射(XRD)、等离子体发射光谱(ICP)、动态光散射(DLS)、透射电镜(TEM)和X射线光电子能谱(XPS)对产物结构进行了表征,并选用白色葡萄球菌、大肠杆菌和枯草芽孢杆菌为受试菌种,分别在无光照、自然光照条件下,采用菌落计数法对水溶胶抗菌性能进行了检测。结果表明,用微波辅助胶溶工艺制备的Fe/Ce共掺杂纳米TiO2为锐钛矿型,其平均粒径为10 nm。Fe/Ce的掺杂改性能有效提高纳米TiO2水溶胶的抗菌性能,尤其是在自然光照条件下,Fe/Ce共掺杂纳米TiO2溶胶在6 h内对各测试菌种的杀菌率均为95%以上,表明Fe/Ce共掺杂纳米TiO2水溶胶具有很高的广谱杀菌性。采用透射电镜(TEM)对杀菌过程中的大肠杆菌菌体形态进行观测,探讨了Fe/Ce共掺杂纳米TiO2水溶胶的抗菌机理。
The Fe/Ce codoped nanometer titanic hydrosol, which could be applied to indoor antisepsis, was counting experiment to make sure the hydrosol had good antibacterial performance. The results showed that these Fe/Ce codoped nano TiO2 hydrosol particles prepared by microwave-assisted peptization process without calcinations treatment had anatase crystal structure, and the average size was 10.8nm. The result of antibacterial experiment showed the Fe/Ce codoped nano-TiO2 hydrosol had better antibacterial performance than the pure nano-TiO2 hydrosol. The relative antibacterial rate exceeded 95% when the illumination of natural light irradiation lasted for 6 h, and there was no discrepancy for different strains. So Fe/Ce codoped nano-TiO2 hydrosol has a potent and broad spectrum antibacterial performance. The morphological change of Escherichia coli were observed by transmission electron microscope（TEM）, and the antibacterial mechanism of Fe/Ce codoped nano-TiO2 hydrosol was discussed.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2009年第11期1928-1934,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金资助项目(No.50678045)
