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This article briefly reviews some of our recent work carried out both from an experimentalpoint of view as well as from a theoretical perspective to gain further understanding of the events that takeplace in Heterogeneous Photocatalysis. Previously, the multitude of reports from our laboratory and frommany others looked at the primary photocatalytic events as involving (a) absorption of light, (b) formationof the free (electrons and holes) and/or trapped charge carriers (Ti3+ and •OH radicals), and (c) reactionof pre-adsorbed acceptor or donor molecules with the relevant trapped carrier. Our recent work notes thatthis view is reasonable if the only purpose of photocatalysis is elimination of undesirable environmentalpollutants. But when we begin to query how to render a process more efficient, we need to address theprimary events following photoexcitation of the photocatalyst, which in most instances has been titaniumdioxide (in the anatase form). Owing to the nature of light absorption by TiO2 we resorted to examining othermetal oxides, most of which are dielectric insulators with very large bandgap energies, for example zirconia(ZrO2) and scandia (Sc2O3). These dielectrics have provided added information on the photophysical events,many of which are masked by the strong light absorption in titania. Despite some of our recent progress,much remains to be done for a fuller understanding of the events that occur at the surface, which we haveoften considered to be the greatest and most complex defect in metal oxide particulates

Photo-induced processes in heterogeneous nanosystems. From photoexcitation to interfacial chemical transformations