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Powder Photocatalysts: Characterization by Isotopic Exchanges and Photoconductivity; Potentialities for Metal Recovery, Catalyst Preparation and Water Pollutant Removal

  • Pierre Pichat
Chapter
Part of the NATO ASI Series book series (ASIC, volume 237)

Abstract

Studies using 1802 and N18 0 heteroexchanges at room temperature over band-gap illuminated powder semiconductor oxides to characterize the light-induced lability of oxygen are reviewed. In particular, the effects of pretreatment, doping, metal deposits are presented, Existence of correlations between photoassisted isotopic exchanges and pnotocatalytic oxidations is shown. Information obtained from photoconductance measurements is then summarized. Correlations between the electrical behaviour of powder semiconductor oxides under vacuum or in an oxygen atmosphere and their activity in oxidations are discussed. Investigations of electron transfers between Pt (or Ni) and TiO2, as well as between CdS and TiO2, under various conditions (vacuum, presence of oxygen and hydrogen) are presented. Concerning the potential applications of heterogeneous photocatalysis, interests for the recovery of precious or toxic metals from dilute solutions and for the preparation of metallic or bimetallic supported catalysts are evaluated. Finally, the possibilities for water decontamination are examined through the case of the degradation of 4-chlorophenol.

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Copyright information

© Springer Science+Business Media Dordrecht 1988

Authors and Affiliations

  • Pierre Pichat
    • 1
  1. 1.Ecole Centrale de LyonEquipe CNRS PhotocatalyseEcully CedexFrance

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