Design and synthesis of ZPMx-Si@GO hybrid nanocomposites with various aspect ratios for water disinfection
| Autor: | K.B. Babitha, A. Peer Mohamed, S. Nishanth Kumar, Solaiappan Ananthakumar, B. S. Dileep Kumar, Vijayan Pooja |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Nanocomposite biology General Chemical Engineering 02 engineering and technology General Chemistry Bacterial growth 010402 general chemistry 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Silane Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry PEG ratio Environmental Chemistry Organic chemistry Surface modification Nanorod 0210 nano-technology Antibacterial activity Bacteria |
| Zdroj: | Chemical Engineering Journal. 324:154-167 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2017.05.012 |
| Popis: | This study investigated the role of poly-ethylene glycol (PEG) in the microwave synthesis of ZnO (ZPMx) nanorods. The molecular weight of PEG was found to strongly influence the aspect ratio of the synthesized material. The as-prepared ZPMx nanorods were post-grafted onto the surface of GO sheets using 3-amino propyl trimethoxy silane (APTMS) as a cross-linking agent to obtain ZPMx-Si@GO hybrid nanocomposites. Microscopic observations showed that ZPMx nanorods with different aspect ratios were evenly distributed on the surface of the GO sheets. It also showed enhanced thermal and chemical properties. The dependence of the antibacterial behavior on the aspect ratio of the ZPMx nanorods and GO was also investigated. An antibacterial assay was carried out using both the Gram-positive bacteria Staphylococcus aureus (S. aureus) and Gram-negative bacteria Escherichia coli (E. coli), and Klebsiella pneumonia (K. pneumonia). The results showed that the ZPMx-Si@GO hybrid nanocomposite had an excellent antibacterial property toward the test bacteria compared to pure ZPMx and GO. The synergistic effect of ZPMx and GO resulted in a superior antibacterial activity in ZPMx-Si@GO. Interestingly, the hybrid nanocomposite with a higher ZPMx aspect ratio (ZPM6000-Si@GO) showed excellent inhibition zones with diameters of ∼3.7, 3.1, and 2.4 cm corresponding to S. aureus, E. coli, and K. pneumonia, respectively. An optical density measurement, as well as the morphological changes in the bacteria, again confirmed the excellent bacterial growth inhibition of ZPM6000-Si@GO. The studies indicated that the ZPMx-Si@GO hybrid nanocomposite is a promising candidate for use in real waste-water disinfection. |
| Databáze: | OpenAIRE |
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