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Fundamentals of TiO2 Photocatalysis. Consequences for Some Environmental Applications

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Heterogeneous Photocatalysis

Part of the book series: Green Chemistry and Sustainable Technology ((GCST))

Abstract

This chapter considers the fundamental phenomena occurring when TiO2 is excited by photons. The focus is first on the formation and fate of the charges generated by the excitation. Then, the roles in photocatalytic reactions of water and oxygen which are almost always present are presented and discussed; the effects of adding ozone or hydrogen peroxide are also briefly indicated. Regarding the photocatalytic degradation of organic compounds – which is involved in potential applications such as self-cleaning materials and air or water purification – the following issues are examined: the hole-induced and hydroxyl radical-induced pathways and the predictability of the nature of the intermediate products. Some of the material aspects of photocatalysis are dealt with through (1) the influence of the structural and textural characteristics of pristine TiO2, (2) the effects of modifying TiO2 by metal deposits or ion doping, and (3) the basic outcomes of combining TiO2 with either another oxide (insulating or semiconducting) or a supplementary adsorbent of high surface area. Conclusions are drawn from these fundamental topics about the applicability of TiO2 photocatalysis.

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  1. Photocatalyse et Environnement, CNRS/Ecole Centrale de Lyon (STMS), 69134, Ecully CEDEX, France

    Pierre Pichat

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  1. Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland

    Juan Carlos Colmenares

  2. State Key Laboratory of Photocatalysis, Fuzhou University, Fuzhou, China

    Yi-Jun Xu

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Pichat, P. (2016). Fundamentals of TiO2 Photocatalysis. Consequences for Some Environmental Applications. In: Colmenares, J., Xu, YJ. (eds) Heterogeneous Photocatalysis. Green Chemistry and Sustainable Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-48719-8_10

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