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

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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.

Affiliations: 1: Institut für Technische Chemie, Leibniz Universität Hannover, Germany, Callinstrasse 3, D-30167 Hannover, Germany; 2: Institut für Technische Chemie, Leibniz Universität Hannover, Germany, Callinstrasse 3, D-30167 Hannover, Germany;, Email: bahnemann@iftc.uni-hannover.de; 3: Sachtleben Chemie, Dr.-Rudolf-Sachtleben-Str.4, D-47198 Duisburg, Germany; 4: Titam Oberflächenschutz, An der Höhe 11, D-88356 Ostrach, Germany; 5: Pilkington Deutschland AG, Haydnstr. 19, D-45884 Gelsenkirchen, Germany

10.1163/156856708784040588
/content/journals/10.1163/156856708784040588
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/content/journals/10.1163/156856708784040588
2008-04-01
2016-12-05

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