Photocatalytic TiO2-Based Nanostructured Materials for Microbial Inactivation

Pathogenic microorganisms can spread throughout the world population, as the currentCOVID-19 pandemic has dramatically demonstrated. In this scenario, a protection against pathogensand other microorganisms can come from the use of photoactive materials as antimicrobial agents ableto hinder, or at least limit, their spreading by means of photocatalytically assisted processes activatedby light—possibly sunlight—promoting the formation of reactive oxygen species (ROS) that can killmicroorganisms in different matrices such as water or different surfaces without affecting humanhealth. In this review, we focus the attention on TiO2nanoparticle-based antimicrobial materials,intending to provide an overview of the most promising synthetic techniques, toward possiblelarge-scale production, critically review the capability of such materials to promote pathogen (i.e.,bacteria, virus, and fungi) inactivation, and, finally, take a look at selected technological applications.