Solar Water Detoxification: Novel TiO2 Powders as Highly Active Photocatalysts

[+] Author and Article Information
M. Lindner, D. W. Bahnemann

Institut fuer Solarenergieforschung GmbH, Sokelantstr. 5, 30165 Hannover, Germany

B. Hirthe, W.-D. Griebler

Sachtleben Chemie GmbH, 47198 Duisburg, Germany

J. Sol. Energy Eng 119(2), 120-125 (May 01, 1997) (6 pages) doi:10.1115/1.2887890 History: Received October 01, 1995; Revised January 01, 1996; Online February 14, 2008


The photocatalytic activity of a novel anatase titanium dioxide powder, namely Sachtleben Hombikat UV 100, has been investigated and compared with that of a well-studied material (i.e., Degussa P25). Laboratory experiments using dichloroacetate (DCA) as the model pollutant have been carried out showing a very high photonic efficiency (ζ) reaching almost unity at low-light intensities. The effect of pH, substrate concentration, catalyst concentration, and addition of various inorganic salts has been thoroughly investigated. The inhibiting effect of anions such as chloride, nitrate, sulphate, and phosphate was completely reversible upon washing the catalyst powder with pure water or diluted base, respectively. The overall photonic efficiency of the DCA degradation was found to decrease with increasing illumination intensity. Various kinetic and mechanistic models are proposed to explain this effect as well as the results of the other experiments. Implications of these laboratory results for “real world” applications, e.g., for the design of appropriate photoreactors, are discussed.

Copyright © 1997 by The American Society of Mechanical Engineers
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