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Research on Chemical Intermediates

, Volume 34, Issue 4, pp 381–392 | Cite as

Photodegradation of methylene blue in water, a standard method to determine the activity of photocatalytic coatings?

  • Jessica Tschirch
  • Ralf Dillert
  • Detlef Bahnemann
  • Bernd Proft
  • Andreas Biedermann
  • Bernhard Goer
Article

Abstract

The degradation of methylene blue (MB) in aqueous solutions has been re-examined as a method to characterize the photocatalytic activity of transparent TiO2 coatings. Increasing irradiation intensities leads to a change in the observed kinetic behavior from zero-order to pseudo-first-order regarding the concentration of MB. This is due to a diffusion inhibition of MB. In order to obtain data within a zero-order kinetic regime at an initial MB concentration of 10 μmol/l and, thus, to avoid the diffusion control, irradiation intensities below E=5 W/m2 for substrates comprising higher photonic efficiencies than ζ=0.09% have to be applied. Recommendations for a standard protocol are given.

Keywords

Photodegradation methylene blue photocatalysis TiO2 coatings kinetics 

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Copyright information

© Springer 2008

Authors and Affiliations

  • Jessica Tschirch
    • 1
  • Ralf Dillert
    • 1
  • Detlef Bahnemann
    • 1
  • Bernd Proft
    • 2
  • Andreas Biedermann
    • 3
  • Bernhard Goer
    • 4
  1. 1.Institut für Technische ChemieLeibniz Universität Hannover, GermanyHannoverGermany
  2. 2.Sachtleben ChemieDuisburgGermany
  3. 3.Titam OberflächenschutzOstrachGermany
  4. 4.Pilkington Deutschland AGGelsenkirchenGermany

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