Visible Light Photocatalyst Anatase Phased TiO2 Nanoparticles for Enhanced Antibacterial Performance

Abstract

This study reports the development of anatase TiO2 synthesized by facile photon-induced method (PIM) at various reaction times of 6 days, 8 days, 10-day samples. The 10 days TiO2 sample shows stable anatase phase, whereas 100% rutile phase at the same temperature was observed for standard TiO2. Mainly, the PIM was used to tuning the properties of visible light absorbance TiO2 photocatalyst used for improving antibacterial performance. The antibacterial activity of TiO2 against Staphylococcus aureus and Escherichia coli was determined by the agar disc diffusion method. Anatase TiO2 nanoparticles demonstrated excellent antibacterial activity against extracellular S. aureus with 80% and E. coli with 82% killing efficacy at concentrations as low as 100 μg/mL, which is 100% faster than the standard and other pure TiO2 reported earlier. The obtained undoped anatase Titania with enhanced chemical reactivity has great potential for antibacterial properties. Moreover, the smaller crystallite size (25 nm) and narrowing bandgap (2.96 eV) TiO2 nanoparticles were more effective in killing bacteria compared with standard TiO2. Therefore, this work indicated that anatase phased TiO2 under visible light absorbance has good potential with excellent clinical applications.