Facile synthesis, characterization of nano-tungsten trioxide decorated with silver nanoparticles and their antibacterial activity against water-borne gram-negative pathogens

Abstract

In the present work, silver decorated tungsten trioxide (WO 3 ) metal-oxide semiconducting nanoparticles were synthesized using a facile wet impregnation technique for inactivation of harmful water-borne gram-negative pathogens. The structural and morphological properties of self-synthesized pure WO 3 nanoparticles (n-WO 3 ) and different weight percentage of Ag metal (3 and 5%) loaded WO 3 (3% n-Ag/WO 3 , 5% n-Ag/WO 3 ) were analyzed by XRD, SEM, TEM and SAED. The loading of Ag on n-WO 3 was confirmed by TEM and SAED analysis. The chemical composition of as-synthesized n-WO 3 , 3% n-Ag/ WO 3 and 5% n-Ag/WO 3 was identified by XPS. The antibacterial characterization and morphogenic studies were done on the following water borne bacteria: Shigella flexneri, Salmonella cholerasis and Escherichia coli. Morphogenesis by electron microscopy revealed the close contact of nanomaterials with the bacterial cell wall and membrane leading to severe damage to the integrity of membrane which caused cell death.

Biodegradable Poly(butylene adipate-co-terephthalate) Antibacterial Nanocomposites Reinforced with MgO Nanoparticles

“…aureus than against E . coli , which is similar to other studies in the literature [ 31 , 32 , 33 , 34 ]. This phenomenon is ascribed to the fact that the peptidoglycan membrane of the Gram-positive bacteria S .…”

“…These results can be ascribed to the superior antibacterial properties of MgO. However, PBAT/MgO@CTAB exhibits better antibacterial efficiency against S. aureus than against E. coli, which is similar to other studies in the literature [31][32][33][34]. This phenomenon is ascribed to the fact that the peptidoglycan membrane of the Gram-positive bacteria S. aureus is much thicker than that of the Gram-negative bacteria E. coli, and as a result, the released Mg ions do not easily penetrate the peptidoglycan membrane and disrupt the essential enzyme systems in the bacteria.…”

Anti-microbial and anti-cancer activities of Mn 0.5 Zn 0.5 Dy x Fe 2-x O 4 (x ≤ 0.1) nanoparticles

“…The significant variation was obtained with the increasing concentration of x content. The obtained results proved, that the antifungal activity was relatively increased with the elevated concentration of 'x' content and goes in agreement with some previous studies, which stated the same effect, on combination of several metallic NPs [40,30,43,44].…”

A comprehensive review on antimicrobial face masks: an emerging weapon in fighting pandemics

“…Metals such as silver (Ag), [122][123][124][125][126] copper (Cu), 84,85,87,127,128 zinc oxide (ZnO), 95,128 tungsten oxide/carbide, 94,129,130 magnesium peroxides, 91 and their combinations are employed as AMA in fabrics or face masks.…”