Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
Volume 9, Issue 4, Pages 171-192Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jphotochemrev.2008.09.001
Keywords
Photoexcitation; Free radicals; Solar irradiation; Electron-hole pairs; Langmuir-Hinshelwood mechanism
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Funding
- University of Texas System for a Science and Technology Acquisition and Retention (STAR) grant
- U.S. Department of Energy (Basic Energy Sciences)
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This review focuses on the heterogeneous photocatalytic treatment of organic dyes in air and water. Representative studies spanning approximately three decades are included in this review. These studies have mostly used titanium dioxide (TiO2) as the inorganic semiconductor photocatalyst of choice for decolorizing and decomposing the organic dye to mineralized products. Other semiconductors such as ZnO, CdS, WO3, and Fe2O3 have also been used, albeit to a much smaller extent. The topics covered include historical aspects, dark adsorption of the dye on the semiconductor surface and its role in the subsequent photoreaction, semiconductor preparation details, photoreactor configurations, photooxidation kinetics/mechanisms and comparison with other Advanced Oxidation Processes (e.g., UV/H2O2, ozonation, UV/O-3, Fenton and photo-Fenton reactions), visible light-induced dye decomposition by sensitization mechanism, reaction intermediates and toxicity issues, and real-world process scenarios. (c) 2008 Elsevier B.V. All rights reserved.
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