Department of Epidemiology and Biostatistics, Harbin Medical University, Harbin 150086, People's Republic of China.
J Hazard Mater. 2011 Mar 15;187(1-3):466-72. doi: 10.1016/j.jhazmat.2011.01.050. Epub 2011 Jan 18.
Stable Ag nanoparticles supported on multi-walled carbon nanotubes (MWCNTs) have been successfully synthesized by calcinations of the complexes of Ag cation and acid-treated MWCNTs under sparging N(2). The nanocomposites are characterized in detail by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-visible absorption spectroscopy. The results indicate that Ag nanoparticles are relatively homogeneously dispersed on the surface of MWCNTs. The bactericidal properties of Ag/MWCNT nanocomposites are investigated with disk diffusion assay on the suspension samples inoculated with Escherichia coli. The results show that Ag/MWCNTs-500 nanocomposites possess excellent bactericidal property because of their suitable particle size (15 nm). Moreover, Ag nanoparticles supported on MWCNTs are very stable for half a year. What is more, the bactericidal effect was enhanced obviously under solar irradiation. This is because MWCNTs can absorb near-infrared light to kill parts of bacteria. A possible formation mechanism is also proposed in this article.
负载在多壁碳纳米管（MWCNTs）上的稳定 Ag 纳米颗粒已通过在 N2 鼓泡下煅烧 Ag 阳离子和酸处理的 MWCNTs 的复合物成功合成。通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和紫外可见吸收光谱对纳米复合材料进行了详细表征。结果表明，Ag 纳米颗粒在 MWCNTs 表面上均匀分散。通过用接种有大肠杆菌的悬浮样品进行圆盘扩散试验，研究了 Ag/MWCNT 纳米复合材料的杀菌性能。结果表明，Ag/MWCNTs-500 纳米复合材料具有优异的杀菌性能，因为其粒径合适（15nm）。此外，负载在 MWCNTs 上的 Ag 纳米颗粒在半年内非常稳定。更重要的是，在太阳照射下，杀菌效果明显增强。这是因为 MWCNTs 可以吸收近红外光来杀死部分细菌。本文还提出了一种可能的形成机制。
