Ce及Zn共掺杂纳米TiO_2协同抗菌效应

Synergistic effect of Ce and Zn co-doped on antibacterial activity of TiO_2

采用溶胶-凝胶法对TiO2进行Ce及Zn单一和共掺杂改性。以金葡萄球菌、大肠杆菌和白念珠菌为菌种,研究组分对材料的可见光抗菌活性影响。运用X射线衍射(XRD)、透射电子显微镜(TEM)、比表面仪(BET)、傅里叶变换红外光谱(FT-IR)和紫外-可见漫反射光谱(UV-Vis-DRS)等测试手段对样品的结构进行表征。实验结果表明,掺杂改性抗菌剂中适量Ce组分的作用,在于通过抑制抗菌剂的晶粒长大和拓展光响应范围等方面,增进抗菌剂的光催化性能。掺杂抗菌剂中适量Zn组分的作用在于提高材料的光催化抗菌性能。Zn、Ce共掺杂TiO2纳米材料表现出良好的协同抗菌效果,协同效应因子(SEF)>0。

Ce and/or Zn doped TiO2 nano-materials were prepared by sol-gel. The antibacterial activity of the as prepared materials under visible light irradiation was evaluated on candida albicans, escherichia coli and staphy lococcus. X-ray diffraction （XRD）, transmission electron microscopy （TEM）, brunauer-emmett-teller surface area （BET） analysis, Fourier transform infrared spectroscopy （FT-IR） and UV-Vis diffuse reflectance spectra （DRS） methods were employed to characterize the as-prepared materials. It has been shown that the role of proper amount of Ce in doped materials played as to inhibit grain growth and extend the light response to the visible region have a favorable effect on the photocatalysis. The role of proper amount of Zn in doped materials played as to enhance the photocatalytie antibacterial activity of as-prepared materials. Zinc and cerium co-doped TiO2 nano-materials exhibit significant synergistic antibacterial effect and the synergistic effect factor was greater than O.