通过溶胶-凝胶法制备了氮氟共掺杂TiO2(N-F-TiO2)溶胶,并利用丝网印刷法在玻璃基底上制备了N-F-TiO2薄膜,通过XRD,XPS及漫反射对N-F-TiO2进行了表征.XRD分析表明制备出的N-F-TiO2以锐钛矿结晶为主;XPS谱显示N元素以N-Ti-O成键的形式掺杂在晶体中,F元素以表面吸附和晶格掺杂的形式存在;紫外-可见漫反射表明与TiO2相比,N-F-TiO2的吸收强度明显增强,光吸收起始位置有明显红移.利用大肠杆菌做为实验菌种,采用可见光与365nm紫外光分别作为激发光源,对其相对存活率及细胞膜损伤程度进行了研究.结果表明:N-F-TiO2薄膜具有较高的杀菌效率,光照60min时紫外光下大肠杆菌相对存活率降低到0,可见光下为10%;细胞损伤实验结果表明在紫外光作为光催化激发光源时,菌悬液中脂质过氧化物(MDA)含量最大值可以达到1.4 nmo1/mg干细胞重,可见光下可以达到0.9 nmo1/mg干细胞重.
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