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使用铁掺杂的二氧化钛-多壁碳纳米管纳米复合材料对细菌进行光灭活。

Photoinactivation of bacteria by using Fe-doped TiO-MWCNTs nanocomposites.

作者信息

Koli Valmiki B, Delekar Sagar D, Pawar Shivaji H

机构信息

Center for Interdisciplinary Research, D.Y. Patil University, Kolhapur, 416 006, India.

Department of Chemistry, Shivaji University, Kolhapur, 416 004, India.

出版信息

J Mater Sci Mater Med. 2016 Dec;27(12):177. doi: 10.1007/s10856-016-5788-0. Epub 2016 Oct 17.

Abstract

In this study, nanocomposites of Fe-doped TiO with multi-walled carbon nanotubes (0.1- 0.5 wt. %) were prepared by using sol-gel method. The structural and morphological analysis were carried out with using X-ray diffraction pattern and transmission electron microscopy, which confirm the presence of pure anatase phase and particle sizes in the range 15-20 nm. X-ray photoelectron spectroscopy was used to determine the surface compositions of the nanocomposites. UV-vis diffuse reflectance spectra confirm redshift in the optical absorption edge of nanocomposites with increasing amount of multi-walled carbon nanotubes. Nanocomposites show photoinactivation against gram-positive Bacillus subtilis as well as gram-negative Pseudomonas aeruginosa. Fe-TiO-multi-walled carbon nanotubes (0.5 wt. %) nanocomposites show higher photoinactivation capability as compared with other nanocomposites. The photoluminescence study reveals that the Fe-TiO-multi-walled carbon nanotubes nanocomposites are capable to generate higher rate of reactive oxygen species species than that of other nanocomposites. Our experimental results demonstrated that the Fe-TiO-multi-walled carbon nanotubes nanocomposites act as efficient antibacterial agents against a wide range of microorganisms to prevent and control the persistence and spreading of bacterial infections.

摘要

在本研究中,采用溶胶-凝胶法制备了掺铁二氧化钛与多壁碳纳米管(0.1 - 0.5 wt.%)的纳米复合材料。利用X射线衍射图谱和透射电子显微镜进行了结构和形态分析,证实了纯锐钛矿相的存在以及粒径在15 - 20纳米范围内。采用X射线光电子能谱来确定纳米复合材料的表面组成。紫外-可见漫反射光谱证实,随着多壁碳纳米管含量的增加,纳米复合材料的光吸收边缘发生红移。纳米复合材料对革兰氏阳性枯草芽孢杆菌以及革兰氏阴性铜绿假单胞菌均表现出光灭活作用。与其他纳米复合材料相比,掺铁二氧化钛-多壁碳纳米管(0.5 wt.%)纳米复合材料表现出更高的光灭活能力。光致发光研究表明,掺铁二氧化钛-多壁碳纳米管纳米复合材料比其他纳米复合材料能够产生更高速率的活性氧物种。我们的实验结果表明,掺铁二氧化钛-多壁碳纳米管纳米复合材料可作为有效的抗菌剂,对抗多种微生物,以预防和控制细菌感染的持续存在和传播。

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