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Kinetics of Photocatalysis Reactions Studied by Transient Absorption Spectroscopy

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Kinetics of Photocatalysis Reactions Studied by Transient Absorption Spectroscopy

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  • Author: Maria Tesa
Photocatalysis is the rate increase of a chemical reaction by light, often in the presence of a catalyst that starts the reaction upon irradiation. Photocatalysts are typically semiconducting metal oxides such as ZnO, Fe2O3 or TiO2 which are employed as particles in solution. When absorbing light, these materials are able to generate electrons and holes which go on to react with chemical species on their surface. The photocatalysis process is illustrated in Figure 1. If a photon of greater energy than the bandgap of the semiconductor is absorbed by the photocatalyst, it excites an electron (e–) from the valence band into the conduction band. This process generates a hole (h+) or positive charge in the valence band. These charge carriers are mobile, albeit short lived, and can evolve through multiple pathways.

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