Title: WATER TREATMENT BY HETEROGENEOUS PHOTOCATALYSIS
Abstract: Catalytic Science SeriesEnvironmental Catalysis, pp. 171-194 (1999) No AccessWATER TREATMENT BY HETEROGENEOUS PHOTOCATALYSISJ.-M HERRMANNJ.-M HERRMANNURA au CNRS Photocatalyse, Catalyse et Environnement, Ecole Centrale de Lyon, BP 163, 69131 Ecully Cédex, FrancePhone : (33) 4 72 18 64 93; fax. (33) 4 78 33 03 37.https://doi.org/10.1142/9781848160613_0009Cited by:31 PreviousNext AboutSectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack CitationsRecommend to Library ShareShare onFacebookTwitterLinked InRedditEmail Abstract: Photocatalysis is based on the double aptitude of the photocatalyst (essentially titania) to simultaneously adsorb both reactants and to absorb efficient photons. The basic fundamental principles are described as well as the influence of the main parameters governing the kinetics (mass of catalyst, wavelength, initial concentration, temperature and radiant flux). Besides various types of photocatalytic reactions (selective mild oxidation of organics, dehydrogenation of alcohols, D2-alkane isotopic exchange), UV-irradiated titania becomes a total oxidation catalyst once in water because of the photogeneration of OH° radicals by neutralisation of OH− surface groups by positive photo-holes. A large variety of organics could be totally degraded and mineralised into CO2 and harmless inorganic anions. Any attempt of improving titania's photoactivity by noble metal deposition or ion-doping was derimental. In parallel, heavy toxic metal ions (Hg2+, Ag+, and noble metals) can be removed from water by photodeposition on titania. Several water detoxification photocatalytic devices have already been commercialised. Solar platforms are working with large scale pilot photoreactors, in which are degraded pollutants with quantum yields comparable to those determined in the laboratory with artificial light. 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Publication Year: 1999
Publication Date: 1999-04-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 65
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