Abstract
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Highlights
SUMMARYThis review will discuss selected topics related to photoinduced chemical reactions in gas/solid heterogeneous systems
The heterogeneous photocatalysis can be defined as “Photocatalysis taking place at the interfacial boundary between two phases” [1]
For both above mentioned mechanisms the F(F+) intrinsic defect looks like renewable “self-sensitizing” agent for electrons and holes photo generation via two step absorption of photons below the fundamental threshold of wide band gap solid
Summary
This review will discuss selected topics related to photoinduced chemical reactions in gas/solid heterogeneous systems. The photoadsorption and photocatalytic (photo assisted) reactions of small molecules at the surface of wide band gap solids mainly will be examined. From the chemical point of view, photoadsorption can be considered as the simplest process induced by photons at gas/solid or liquid/solid interface. The variety of photophysical events preceding chemical stages of photocatalytic reaction are often similar (if not the same) to the events characteristic of small molecules photoadsorption. The special emphasis will be on the photoexcitation of solids which precedes the chemical interaction of molecules at illuminating solid surface during photoadsorption and photocatalysis. The concept of surface photoadsorption (photocatalytic) center will be considered in more details in connection with the photoexcitation of a photocatalysts
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