铁、铈共掺杂纳米TiO2溶胶的制备及抗菌性能

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。

Preparation and Antibacterial Property of Fe/Ce Codoped Nano-Titanic Hydrosol

The Fe/Ce codoped nanometer titanic hydrosol, which could be applied to indoor antisepsis, was prepared under atmospheric pressure by microwave-assisted peptization process. The products were characterized by X-ray diffraction(XRD), inductively coupled plasma-atomic emission spectrometry(ICP), dynamic light scattering(DLS), transmission electron microscope(TEM), and X-ray photoelectron spectrometer(XPS). Using colony 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.