Principally, photocatalytic reactions commence by photoexciting the surface of photocatalyst with UV–Vis radiation, which can provide the appropriate band gap energy to generate photoactivated electron–hole pairs (R1). In parallel, ozone molecules can adsorb on the surface of the photocatalyst via three different interactions: physical adsorption, formation of weak hydrogen bonds with surface hydroxyl groups,and molecular or dissociative adsorption into Lewis acid sites [35], each interaction resulting in the production of active oxygen radicals
ð
OÞ (R2).