Is there a standard process for measuring the photocatalytic activity of TiO2?
Under standard I mean well-studied.
The answer is decomposition of methylene blue.
Article Is Methylene Blue An Appropriate Substrate for A Photocataly...
Photocatalysts are typically evaluated in the photodegradation of dyes or organic pollutants in aqueous solutions. Methylene blue is a common model substrate, as are Rhodamine B and azo-dyes.
To test photocatalytic activity of TiO2, RB5 or methylene blue are model substrates which are used widely.
Everybody is able to make MB and RB tests. That explains their wide use. But they should be used only if you want to decolorize water. For other applications there are more complex tests.
The use of dyes as models for the study of photocatalytic reaction is well known, however the reaction kinetics id pH dependent. So you should take care about this parameter when you chose dyes. MB is good candidate for photocalatytic reaction.
Dear Dr. Iva Ninova Kuznetsova,
The paper mentioned is devoted to the suitability of MB to be used for measuring the photocatalytic activity of modified TiO2 under visible-light irradiation.
So, for measuring the photocatalytic activity of pristine TiO2, MB should work just fine.That is why I posted that paper :)
Use of RB5 or methylene blue for the study of photocatalytic activity of TiO2 is well known, but not really good. Because measurement of
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