Additional Effects of Silver Nanoparticles on Bactericidal Efficiency Depend on Calcination Temperature and Dip-Coating Speed
Additional Effects of Silver Nanoparticles on Bactericidal Efficiency Depend on Calcination Temperature and Dip-Coating Speed
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DOI：
10.1128/aem.00049-11
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发表时间：
2011-07
影响因子：
4.4
通讯作者：
N. Le;H. Nagata;Mutsumi Aihara;A. Takahashi;T. Okamoto;T. Shimohata;K. Mawatari;Y. Kinouchi;M. Akutagawa;M. Haraguchi
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文献类型：
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作者：
N. Le;H. Nagata;Mutsumi Aihara;A. Takahashi;T. Okamoto;T. Shimohata;K. Mawatari;Y. Kinouchi;M. Akutagawa;M. Haraguchi
人们对光催化特性在表面、空气和水的消毒中的应用越来越感兴趣。二氧化钛被广泛用作光催化剂，据报道，加入银可以增强其杀菌作用。然而，纳米银和TiO2的协同作用还不清楚。研究了不同焙烧温度、浸涂速度、TiO2、SiO2和Ag的配比对萎缩芽孢杆菌的光催化去除效果，以确定生产用于表面消毒的TiO2和/或TiO2/Ag涂层玻璃的最佳生产条件。纯TiO2或TiO2 + Ag纳米粒子的光催化消毒主要取决于煅烧温度。在高浸涂速度和高煅烧温度（600℃）条件下，TiO2薄膜的抗菌活性最佳。采用TiO2/ ag镀膜玻璃，在高速浸渍涂层下，在较低的煅烧温度（250℃）下，也观察到最大程度的细菌失活。扫描电镜（SEM）结果表明，在高温下，Ag纳米粒子结合在一起，导致TiO2/Ag膜的抗菌活性下降，这是由于Ag纳米粒子的表面积较小。Ag的存在提高了TiO2的光催化失活率，随着催化剂负载水平的增加，其效果更加明显。
ABSTRACT There is an increasing interest in the application of photocatalytic properties for disinfection of surfaces, air, and water. Titanium dioxide is widely used as a photocatalyst, and the addition of silver reportedly enhances its bactericidal action. However, the synergy of silver nanoparticles and TiO2 is not well understood. The photocatalytic elimination of Bacillus atrophaeus was examined under different calcination temperatures, dip-coating speeds, and ratios of TiO2, SiO2, and Ag to identify optimal production conditions for the production of TiO2- and/or TiO2/Ag-coated glass for surface disinfection. Photocatalytic disinfection of pure TiO2 or TiO2 plus Ag nanoparticles was dependent primarily on the calcination temperature. The antibacterial activity of TiO2 films was optimal with a high dip-coating speed and high calcination temperature (600°C). Maximal bacterial inactivation using TiO2/Ag-coated glass was also observed following high-speed dip coating but with a low calcination temperature (250°C). Scanning electron microscopy (SEM) showed that the Ag nanoparticles combined together at a high calcination temperature, leading to decreased antibacterial activity of TiO2/Ag films due to a smaller surface area of Ag nanoparticles. The presence of Ag enhanced the photocatalytic inactivation rate of TiO2, producing a more pronounced effect with increasing levels of catalyst loading.