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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 microwave-assisted peptization process was used to prepare iron-cerium-codoped nano-TiO2 hydrosol at room temperature under the atmospheric pressure. X-ray diffraction (XRD), plasma emission spectrometry (ICP), dynamic light (DLS), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were used to characterize the product structure. Staphylococcus aureus, Escherichia coli and Bacillus subtilis were selected as the tested strains. Under the light conditions, the colony counting method was used to test the antibacterial property of hydrosol. The results show that the Fe / Ce co-doped nano-TiO2 prepared by microwave-assisted peptization is anatase, and its average particle size is 10 nm. The doping modification of Fe / Ce can effectively improve the antibacterial property of nano-TiO2. Especially under natural light conditions, the sterilization rate of Fe / Ce co-doped nano-TiO2 sol for each tested species was 95 %, Indicating that the Fe / Ce co-doped nano-TiO2 hydrosol has a very high broad-spectrum bactericidal activity. Transmission electron microscopy (TEM) was used to observe the morphology of Escherichia coli during sterilization, and the antibacterial mechanism of Fe / Ce co-doped nano-TiO2 hydrosol was discussed.