Nanotechnology
Zeena R. Rhoomi; Duha S. Ahmed; Majid S. Jabir; Anjan Kumar
Abstract
Bismuth tungstate (Bi2WO6) is an aurivillius oxide with potential as a visible light-active photocatalyst. However, its wide band gap limits absorption of visible light. Decoration with multi-walled carbon nanotubes (MWCNTs) has been shown to enhance photocatalytic properties. This study reports the ...
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Bismuth tungstate (Bi2WO6) is an aurivillius oxide with potential as a visible light-active photocatalyst. However, its wide band gap limits absorption of visible light. Decoration with multi-walled carbon nanotubes (MWCNTs) has been shown to enhance photocatalytic properties. This study reports the hydrothermal synthesis of pure Bi2WO6 and Bi2WO6-MWCNT nanocomposites using a 1:2.5 molar ratio of Bi2WO6:MWCNTs. Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and energy dispersive X-ray spectroscopy analysis were used to characterize the morphology, chemical bonding, and composition. Adding MWCNTs reduced particle size, increased surface area, and prevented aggregation. Antibacterial testing showed the Bi2WO6-MWCNT nanocomposite inhibited Pseudomonas aeruginosa, a multidrug-resistant bacterium, more effectively than pure Bi2WO6. Investigation of morphology and bonding revealed the influence of decorated and embedded MWCNTs on bismuth components and particle size. Enhanced antibacterial and anti-biofilm activity of the nanocomposite may be due to increased oxidative stress from reactive oxygen species generation. This facile hydrothermal method synthesizes a Bi2WO6-MWCNT nanocomposite combining the properties of both materials, showing promise for biomedical applications.
Biotechnology
Huda N. Abid; Amar Al-Keisy; Duha S. Ahmed; Sangeeta Singh
Abstract
Recently, bi-based photocatalysts have begun to be used in biological applications. However, the antibacterial ability of a Bi-based photocatalyst is still unclear. In this study, Bi2MoO6 and Bi2WO6 were successfully synthesised by a hydrothermal approach. The fabricated samples were characterised by ...
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Recently, bi-based photocatalysts have begun to be used in biological applications. However, the antibacterial ability of a Bi-based photocatalyst is still unclear. In this study, Bi2MoO6 and Bi2WO6 were successfully synthesised by a hydrothermal approach. The fabricated samples were characterised by X-ray diffraction, FESEM, and UV-Vis spectra. Besides, the antibacterial activity of both photocatalyst samples toward E. coli as unfavourable and S. aureus as positive pathogens were studied. Compared with the antibacterial of Bi2WO6, the resultant Bi2MoO6 exhibited high susceptibility to S. aureus bacterial strain, revealing large zones of 24 mm to 29 mm. Bi2WO6 exhibited less susceptibility of 17.5 mm to 21.5 mm compared with the zone of inhibition against tested bacterial E. coli. Besides, a possible mechanism suggested the effect of the nanosheet structure of samples to penetrate the cell membrane, which results in leakage of interior cell and complete death, and these results will provide some support for the applications of Bi2MoO6 and Bi2WO6 in antibacterial materials under typical environments.
