锌铈共掺杂二氧化钛纳米材料制备与表征及其抗菌性能的研究(英文)

Preparation and Characterization of Zinc and Cerium Co-doped Titania Nano-materials with Antibacterial Activity

采用溶胶-凝胶法,在不同的焙烧温度下合成锌/铈共掺杂二氧化钛纳米材料。用X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(DRS)对样品进行了表征。采用抑菌环法,以大肠杆菌为实验菌种,对Zn/Ce-TiO2纳米材料抗菌性能进行检测。结果表明:样品的结晶度和晶相完全取决于焙烧温度的高低;部分锌进入二氧化钛晶格中,其余掺杂离子以CeO2和Zn2Ti3O8形式存在;与暗态下相比,在可见光激发下,Zn/Ce-TiO2纳米材料具有超强的抗菌性。对锌/铈共掺杂作用机制进行了深入探讨。

Zinc and cerium co-doped titania （Zn/Ce-TiO2） nano-materials were synthesized by a Sol-Gel method at different calcination temperatures. Zn/Ce-TiO2 nano-materials were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, X-ray photoelectron spectroscope （XPS） and UV-Vis diffuse reflectance spectra （DRS）. With the test of bacterial inhibition zone, the antibacterial properties of Zn/Ce-TiO2 nano-materials on E. coli. were investigated. The results show that crystallinity and the crystal phase of nano-materials are closely dependent on the calcination temperature. Zinc ions and cerium ions exist in the form of Zn2Ti308 and CeO2 phase, respectively. The Zn/Ce-TiO2 nano-materials synthesized exhibit enhanced antibacterial activity under visible light irradiation compared with it in the dark. Ultimately, the action mechanism of Zn/Ce co-doping is discussed.