Abstract
Colloidal Ti/Fe mixed oxide nanoparticles were synthesized in aqueous solution with the Fe3+content varying from 0.05 up to 50 at% and particle diameters between 4 and 6 nm. The absorption spectra of these particles could be shifted considerably into the visible part of the solar spectrum with increasing content of ferric ions. The photophysical properties of the newly synthesized particles were examined in detail. Steady state illumination experiments showed a reversible bleaching of the absorption spectrum in the presence of a hole scavenger indicating that a negative excess charge could be stored. The origin of the bleaching was studied in detail using time-resolved flash photolysis measurements. The photocatalytic activity of the Ti/Fe mixed oxide particles was compared to that of pure colloidal TiO2 by studying the photooxidation of dichloroacetate (DCA) in acidic and alkaline media. It could be demonstrated that the incorporation of iron into TiO2 leads to an enhancement of the degradation efficiency, especially in acidic solutions. However, a release of Fe(II) was observed during the course of these detoxification reactions evincing that the newly synthesized catalyst partially photocorrodes. Strategies are suggested to suppress this cathodic process.
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References
Häfner, M. (1989) Wasser ist kein Naturprodukt mehr, Natur 10, 20–23.
Dieter, H. H. (1989) Gebt dem Grenzwert eine Chance! Pestizide im Trinkwasser, Wechselwirkung 43, 4–9.
Carey, J. H., Lawrence, J., and Tosine, H. M. (1976) Photodechlorination of PCB’s in the presence of titanium dioxide in aqueous suspensions, Bull. Environ. Contain. Toxicol. 16, 697–701.
Robin, E. (1989), Sunlight found to help break down organic pollutants, San Francisco Examiner May 20, D-3.
Fettwell, J. (1989) Semiconductors help the sun to clean water, New Sci. June 10, 36.
Thornton, J. (1989) Sunlight destroys hazardous waste, SERI S&T In Review, 8.
Hecht, J. (1990) Sunlight gives toxic waste a tanning, New Sci. April 14, 28.
Serpone, N. and Pelizzetti, E. (1989) Photocatalysis: Fundamentals and Applications, J. Wiley & Sons, New York.
Pelizzetti, E., Minero, C., and Mamino, C. (1990) The role of colloidal particles in the photodegradation of organic compounds of environmental concern in aquatic systems, Adv. Coll. Interface. Sci. 32, 271–316.
Bahnemann, D., Bockelmann, D., and Goslich, R. (1991) Mechanistic studies ofwaterdetoxificationinilluminated TiO2 suspensions, Solar Energy Materials 24, 564–583.
Hoffmann, M.R., Martin, S.T., Choi, W., and Bahnemann, D. W. (1995), Environmental applications of semiconductor photocatalysis, Chem. Rev. 95, 69–96.
Gerischer, H. (1979) Solar photoelectrolysis with semiconductor electrodes, Topics Appl. Phys. 31, 115–171.
Kormann, C., Bahnemann, D. W., and Hoffmann, M. R. (1988) Preparation and characterization of quantum size titanium dioxide (TiO2), J. Phys. Chem. 92, 5196–5201.
Hilgendorff, M. (1991) Mechanistische Untersuchungenzum Photokatalytischen Abbau von Dichloressigsäure, Diplomarbeit, Universität Hannover,.
Bockelmann, D. (1989) Photokatalytischer Abbau Halogenierter Kohlenwasserstoffe an Halbleiteroberflächen, Diplomarbeit, TU Clausthal,.
Heller, H. G. and Langan, J. R. (1981) A new reusable chemical actinometer, EPA Newslett., 71–73.
Weiß, J. (1983) Einführung in die lonenchromatographie: Grundlagen, Instrumentation and Anwendung, Teil 1, Chemie in Labor and Betrieb, 34, 293–297.
Koch, U., Fojtik, A., Weller, H., and Henglein, A. (1985) Photochemistry of semiconductor colloids: preparation of extremely small ZnO particles, fluorescence phenomena and size quantization effects, Chem. Phys. Lett. 122, 507–510.
Henglein, A., Kumar, A., Janata, E., and Weller, H. (1986) Photochemistry and radiation chemistry of semiconductor colloids: reaction of hydrated electrons with CdS and non-linear optical effects, Chem. Phys. Lett. 132, 133–136.
Spanhel, L., Weller, H., Fojtik, A., and Henglein, A. (1987) Photochemistry of semiconductor colloids: strong luminescing CdS and CdS-Ag2S particles, Ber. Bunsenges. Phys. Chem. 91, 88–94.
Bahnemann, D. W., Kormann, C., and Hoffmann, M. R. (1987) Preparation and characterization of quantum size zinc oxide: a detailed spectroscopic study, J. Phys. Chem. 91, 3789–3798.
Abdullah, M., Low, G. K.-C., and Matthews, R. W. (1990) Effects of common inorganic anions on rates of photocatalytic oxidation of organic carbon over illuminated titanium dioxide, J. Phys. Chem. 94, 6820–6825.
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© 1996 Kluwer Academic Publishers
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Bockelmann, D., Lindner, M., Bahnemann, D. (1996). From Nano-Sized Particles to Commercial Products. In: Pelizzetti, E. (eds) Fine Particles Science and Technology. NATO ASI Series, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0259-6_46
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DOI: https://doi.org/10.1007/978-94-009-0259-6_46
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-4047-8
Online ISBN: 978-94-009-0259-6
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