Preparation of Anatase Titanium Dioxide Nanoparticle Powders Submitting Reactive Oxygen Species (ROS) under Dark Conditions

Abstract

Recently, under the circumstances of pandemic of COVID-19 much attention has been paid to titanium dioxide TiO 2 as bactericidal agent; however, conventional TiO 2 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 TiO 2 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 TiO 2 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 TiO 2 could submit much reactive oxygen species (ROS) even in the dark, which has close relation with bactericidal activity in light interception.

Evaluation of Reactive Oxygen Species (ROS) Generated on the Surface of Copper Using Chemiluminesence

“…Reactive oxygen species are generated on the surface of metal copper and metal oxides such as zinc and titanium oxides too. The present authors have been publishing some papers of the antibacterial activity of ZnO [7] [8] [9] anatase TiO 2 [10], which activity can be sustained even in a dark condition (i.e., no sunlight). And further, a paper of anatase TiO 2 added Cu powders with improved antibiotic properties has been published recently [11].…”

Anti-microbial and methylene blue dye adsorption properties of cotton fabrics modified with TiO2, Fe, Ag-doped TiO2, and graphene oxide nanomaterials

“…24 The crystal structures, morphology, and size of TiO 2 NPs are the most important properties that affect their antimicrobial [25][26][27] and dye removal 28 properties. Nguyen et al 29 reported that doped anatase TiO 2 NPs can work as an anti-microbial material under dark conditions as a result of submitting reactive oxygen species.…”

“…Nguyen et al. 29 reported that doped anatase TiO 2 NPs can work as an anti-microbial material under dark conditions as a result of submitting reactive oxygen species.…”