Bactericidal Activity of Aqueous Acrylic Paint Dispersion for Wooden Substrates Based on TiO(2) Nanoparticles Activated by Fluorescent Light

The photocatalytic effect of TiO(2) has great potential for the disinfection of surfaces. Most studies reported in the literature use UV activation of TiO(2), while visible light has been used only in a few applications. In these studies, high concentrations of TiO(2), which can compromise surface properties, have been used. In this work, we have developed an acrylic-water paint dispersion containing low TiO(2) content (2 vol %) for the inactivation of microorganisms involved in hospital-acquired infections. The nanoparticles and the coating have been characterized using spectroscopic techniques and transmission electron microscopy, showing their homogenous dispersion in the acrylic urethane coating. A common fluorescent light source was used to activate the photocatalytic activity of TiO(2). The paint dispersion showed antimicrobial activity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The coating containing the TiO(2) nanoparticles maintained good UV stability, strong adhesion to the substrate and high hardness. Therefore, the approach used is feasible for paint formulation aimed at disinfection of healthcare surfaces.