载银方式对TiO_2纳米管抗菌性能的影响  

Effect of Ag-Loading Methods on TiO_2 Nanotube's Antibacterial Performance

作　　者：王洪芬[1] 魏璐瑶 徐官平 陈守刚[1] 

机构地区：[1]中国海洋大学材料科学与工程研究院,山东青岛266100

出　　处：《山东科技大学学报（自然科学版）》2015年第3期91-97,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：山东省博士基金项目(BS2013CL014);中国海洋大学本科生研究发展计划项目(1412011711)

摘　　要：以碱水热法制备的锐钛矿型TiO2纳米管为载体,分别采用银镜反应和紫外光照还原反应两种不同载银方式制备了载银TiO2纳米管,并利用TEM,XRD及DRS测试对产物形貌、物相组成及光学性能进行了表征。研究发现：紫外光照还原反应在TiO2纳米管表面负载了直径在5~20nm的纳米银颗粒,载银后TiO2纳米管的光吸收能力增强且吸收边带从404nm红移至421nm;而银镜反应则在TiO2纳米管表面生成了单质银层,载银后产物在波长范围335~800nm的光吸收能力增强,但同时过厚的银层也抑制了TiO2光生载流子的产生。另外,通过抑菌圈法和震荡烧瓶法对载银TiO2纳米管进行的抗菌测试表明,紫外光照还原载银TiO2纳米管的抗菌能力优于银镜反应载银TiO2纳米管的抗菌能力;同时,可见光照条件下两种载银TiO2纳米管的抗菌能力均比暗态条件下的抗菌能力有所提高。Ag-loaded TiO2 nanotubes were prepared with anatase TiO2 nanotubes as supports by silver-mirror reaction and photo-reduction,respectively.Transmission electronic microscopy（TEM）,X-ray diffraction（XRD）and UVVIS（ultraviolet-visible spectroscopy）diffuse reflectance spectroscopy（DRS）were used to evaluate their morphology,phase composition and optical property.The study found that silver nanoparticles with diameters of 5-20 nm were successfully loaded on the surface of TiO2 nanotubes by photo-reduction,and the Ag-loaded TiO2 nanotubes showed a strong absorption in UV-VIS light region while the absorption band edge shifted from 404 nm to 421 nm.However,after a silver-mirror reaction,TiO2 nanotubes were covered with a thick silver coating,which restrained the production of photogenerated charge carriers although it had a strengthened light absorption capacity within the range of335~800nm in wave length.The diffusion inhibition zone method and shake flask method were used to compare the antibacterial performance of Ag-loaded TiO2 nanotubes prepared by different reaction methods.The results show that the Ag-loaded TiO2 nanotubes prepared by photo-reduction have better antibacterial performance than the Ag-loaded TiO2 nanotubes prepared by silver-mirror reaction.In addition,the Ag-loaded TiO2 nanotubes prepared by both of the two methods show better antibacterial performance when they are under visible light than when they are in the dark.

关 键 词：TIO2纳米管 光化学还原 银镜反应 抗菌性能 

分 类 号：O621.254.2[理学—有机化学]