Facile synthesis of Ag nanoparticles supported on MWCNTs with favorable stability and their bactericidal properties.
Facile synthesis of Ag nanoparticles supported on MWCNTs with favorable stability and their bactericidal properties.
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DOI：
10.1016/j.jhazmat.2011.01.050
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发表时间：
2011-03
影响因子：
13.6
通讯作者：
Zhenzi Li;Lijun Fan;Zhang Tao;Kang Li
中科院分区：
文献类型：
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作者：
Zhenzi Li;Lijun Fan;Zhang Tao;Kang Li
在通入氮气的条件下，将酸处理后的多壁碳纳米管（MWCNTs）与Ag阳离子形成复合物，通过煅烧，成功地制备了稳定的多壁碳纳米管负载Ag纳米粒子。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（UV-vis absorption spectroscopy）对复合材料进行了表征。结果表明，Ag纳米粒子在MWCNTs表面的分散比较均匀.采用纸片扩散法研究了Ag/MWCNT纳米复合材料对大肠杆菌的杀菌性能。结果表明，Ag/MWCNTs-500纳米复合材料具有良好的杀菌性能，这是由于其粒径大小合适（15 nm）。此外，负载在MWCNTs上的Ag纳米粒子是非常稳定的半年。在太阳光照射下，杀菌效果明显增强。这是因为多壁碳纳米管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。
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 N2. 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 (15nm). 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.