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

被引：80

作者：

Tschirch, Jessica ^{[1
]}

Dillert, Ralf ^{[1
]}

Bahnemann, Detlef ^{[1
]}

Proft, Bernd ^{[2
]}

Biedermann, Andreas ^{[3
]}

Goer, Bernhard ^{[4
]}

机构：

[1] Leibniz Univ Hannover, Inst Tech Chem, D-30167 Hannover, Germany

[2] Sachtleben Chem, D-47198 Duisburg, Germany

[3] Titam Oberflachenschutz, D-88356 Ostrach, Germany

[4] Pilkington Deutschlandg AG, D-45884 Gelsenkirchen, Germany

来源：

RESEARCH ON CHEMICAL INTERMEDIATES | 2008年 / 34卷 / 04期

关键词：

photodegradation; methylene blue; photocatalysis; TiO(2) coatings; kinetics;

D O I：

10.1163/156856708784040588

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The degradation of methylene blue (MB) in aqueous solutions has been re-examined as a method to characterize the photocatalytic activity of transparent TiO(2) 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 mu mol/l and, thus, to avoid the diffusion control, irradiation intensities below E = 5 W/m(2) for substrates comprising higher photonic efficiencies than zeta = 0.09% have to be applied. Recommendations for a standard protocol are given.

引用

页码：381 / 392

页数：12

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