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Mechanisms of Reactions Induced by Photocatalysis of Titanium Dioxide Nanoparticles

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Environmental Photochemistry Part III

Part of the book series: The Handbook of Environmental Chemistry ((HEC,volume 35))

Abstract

Photochemical reactions induced by TiO2 nanoparticles share common mechanistic features where electron and hole pairs are formed, migrate to the surface, and their recombination competes with their reaction with various substrates. The main interest in TiO2 photocatalysis is related to its potential application for decontamination of water and air. However, the absorption of TiO2, which is limited to UV light, does not enable the use of natural or cheap light sources, and therefore tremendous effort has been invested in inducing visible-light activity via modification of TiO2 including doping with nonmetals and metals, surface coating, and bi- and multicomponent assembling. In addition, much research has been carried out to inhibit the electron–hole recombination and enhance the reactions of holes and electrons with substrates. The basic mechanism of bare and modified TiO2 and the main principles of the photocatalytic processes remain similar, although the excitation energy is different and the energies of the electrons and holes and their reaction kinetic parameters may vary. These photocatalytic processes are reviewed and discussed.

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Acknowledgment

This work was supported by the Israel-USA BSF.

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Authors and Affiliations

  1. Accelerator Laboratory, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel

    Joseph Rabani & Sara Goldstein

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  1. Joseph Rabani
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  2. Sara Goldstein
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Correspondence to Joseph Rabani .

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  1. Institut für Technische Chemie, Leibniz Universität Hannover, Hannover, Germany

    Detlef W. Bahnemann

  2. School of Chemistry and Chemical Enginee, Queen's University Belfast, Belfast, United Kingdom

    Peter K.J. Robertson

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Rabani, J., Goldstein, S. (2013). Mechanisms of Reactions Induced by Photocatalysis of Titanium Dioxide Nanoparticles. In: Bahnemann, D., Robertson, P. (eds) Environmental Photochemistry Part III. The Handbook of Environmental Chemistry, vol 35. Springer, Berlin, Heidelberg. https://doi.org/10.1007/698_2013_248

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