Copper(ІІ)-doped WO₃ nanoparticles with visible light photocatalytic antibacterial activity against gram-positive and gram-negative bacteria

Abstract

Simple impregnation technique was used to modify the surface of tungsten (VI) oxide (WO₃) with Cu(II) nanoclusters at molar fraction 1, 3, and 5% mol. Cu(ІІ)–WO₃ photo catalysts were studied by, UV-visible light spectra, and FTIR measurements were carried out, respectively. UV–vis reflectance method of Cu(ІІ)–WO₃ nanoparticles display that the optical absorption was in the visible region of approximately 2.7 eV; this also assure the combination of Cu ions in the lattice of WO₃ crystal. AFM images showed homogeneous distribution of copper in the matrix of WO₃. Two bacterial pathogens, gram-positive Staphylococcus aureus and gram-negative Escherichia coli, were lighted for 180 and 240 min with Cu(ІІ)–WO₃ nanoparticles for photocatalytic inactivation. This displays a fundamental diminution in number of bacteria. The survival number of all bacteria species is not influenced in dark with nanoparticles and in light condition without nanoparticles.

Keywords:

• Photocatalyst
• antibacterial activity
• tungsten (VI) oxide (WO₃)
• AFM