中文摘要：

采用溶胶凝胶-水热反应法,以金属银元素和非金属氮元素掺杂改性二氧化钛,制备出银氮共掺杂二氧化钛光催化剂,利用XRD、SEM、TEM和IR等测试技术对Ag-N-TiO_2的晶型结构、形貌结构、元素组成等进行表征。结果表明,采用溶胶凝胶-水热反应法所制备的Ag-N-TiO_2具有晶型好、结晶度高、粒径小（11.32 nm）、分布均匀等优点。以大肠埃希氏菌为目标细菌,考察Ag-N-TiO_2可见光光催化和避光条件下抗菌性能。结果表明,Ag-N-TiO_2在可见光和避光条件下都具有良好的抗菌效果,对大肠埃希氏菌的抑菌圈直径分别达到了15.2 mm和14.7 mm,SEM形态表征显示,添加催化剂的细菌细胞表面出现凹陷、皱褶或孔洞,同时鞭毛消失,表明所制催化剂具有良好的抗菌效果。

英文摘要：

An Ag-N-codoped TiO_2 photocatalyst was prepared by a new sol-gel hydrothermal method and its morphology,structure and elemental composition were characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,transmission electron microscopy（ TEM） and infrared spectroscopy（ IR）. Meanwhile,the antibacterial activity on Escherichia coli of Ag-N-TiO_2 was also studied. The synthesized Ag-N-TiO_2 photocatalyst displayed good crystal structure with high crystallinity,uniform dispersion and nano-order-scale size（ diameter was about 11. 32 nm）. Furthermore,it showed high antibacterial activity against Escherichia coli,with an average diameter of the antibacterial halo of 15. 2 mm and 14. 7 mm in visible light and dark conditions,respectively. SEM images revealed that the surface of bacterial cells became sunken,corrugated,and perforated,and that the flagella were lost. Therefore,the Ag-N-TiO_2 photocatalyst has the potential for use in the disinfection of drinking water.