Abstract
Recently, under the circumstances of pandemic of COVID-19 much attention has been paid to titanium dioxide TiO2 as bactericidal agent; however, conventional TiO2 requires ultraviolet radiation or visible light to exercise its photocatalytic properties and its induced antimicrobial activity. In order to expand its applications directed at wide civil life, antibacterial TiO2 being usable under dark conditions has been demanded. The present paper describes the powder characterization of newly developed potassium K and phosphorous P co-doped nanometer-size anatase TiO2 powders using X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM & TEM), Brunauer-Emmett-Teller method (BET), fourier-transform infrared spectroscopy (FT-IR), X-ray absorption fine structure (XAFS), electron spin resonance (ESR) and chemiluminescence (CL). It was found for the first time that thus prepared anatase TiO2 could submit much reactive oxygen species (ROS) even in the dark, which has close relation with bactericidal activity in light interception.
Highlights
In order to expand its applications directed at wide civil life, antibacterial TiO2 being usable under dark conditions has been demanded
The present paper describes the powder characterization of newly developed potassium K and phosphorous P co-doped nanometer-size anatase TiO2 powders using X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM & TEM), BrunauerEmmett-Teller method (BET), fourier-transform infrared spectroscopy (FT-IR), X-ray absorption fine structure (XAFS), electron spin resonance (ESR) and chemiluminescence (CL)
We found that anatase (a-TiO2) powders which could submit a lot of reactive oxygen species (ROS) even in the dark; the amounts of ROS were much higher than our previous antibacterial ZnO, in addition, this powder could be prepared with much simpler process
Summary
Many papers and reviews concerning about toxicity mechanism have been published from the viewpoints of reactive oxygen species (ROS) [10]-[17], that is hydroxyl radical ·OH and superoxide anion O2− which are generated by hole-electron pairs in the valence and conduction bands of TiO2, respectively. Their bactericidal mechanism has been explained by introducing bio-cell wall damage and lipid peroxidation of membrane, and TiO2 NPS’s adherence to intercellular organelles and biological macro molecules [17] [18] [19] [20] [21]
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