Li掺杂二氧化钛抗菌材料的表征及抗菌性

Characterization and Antibacterial Properties of Li-Doped Nano-TiO2 Antibacterial Material

通过溶胶-凝胶法(Sol-gel)进行金属Li离子掺杂TiO 2抗菌剂的制备,采用大肠杆菌(ATCC 25922)为实验菌种,对掺杂锂源、掺杂量、表面活性剂、焙烧温度等因素对材料抗菌性能的影响进行探究,并讨论了该抗菌材料的抗菌机理.应用X射线衍射(XRD)、扫描电镜(SEM)和紫外可见漫反射光谱(UV-Vis-DRS)等测试手段对样品的基本形貌、物相结构及光吸收特性进行表征,通过调整制备过程中各影响因素,得到Li掺杂TiO 2抗菌材料的最优反应条件.实验得出,Li掺杂TiO 2纳米抗菌材料对大肠杆菌的抗菌率达到99.5%以上,其抑菌环直径达到2.6 cm.该抗菌材料通过抑制抗菌剂的晶粒长大和拓展光响应范围等方法增进抗菌剂的光催化性能.

Lithium doped titania(Li-TiO 2)nano-materials were synthesized by a Sol-gel method.Using E.coli(ATCC 25922)as the target strain,the influences of factors such as doping lithium source,doping amount,surfactant,calcination temperature and other factors on the antibacterial properties of the materials were investigated,and the antibacterial mechanism of the antibacterial materials was discussed.Li-TiO 2 nano-materials were characterized by X-ray diffraction(XRD),scanning electronic microscope(SEM)and UV-Vis diffuse reflectance spectra(DRS).The experimental results show that the optimal reaction conditions of Li-doped TiO 2 nano-antibacterial materials can be achieved by adjusting the conditions of Li source,doping amount,surfactant type and calcination temperature.It is also found that the optimal antibacterial rate of Li doped TiO 2 antibacterial material against E.coli is more than 99.5%and the diameter of its antibacterial ring reaches 2.6 cm.The photocatalytic properties of the antibacterial agent are improved by inhibiting the grain growth of the antibacterial agent and expanding the light response range.