Notes on heterogeneous photocatalysis with the model azo dye acid orange 7 on TiO2

0484598 - ÚFCH JH 2018 RIV NL eng J - Journal Article
Baudys, M. - Zlámal, M. - Krýsa, J. - Jirkovský, Jaromír - Klusoň, Petr
Notes on heterogeneous photocatalysis with the model azo dye acid orange 7 on TiO2.
Reaction Kinetics Mechanism and Catalysis. Roč. 106, č. 2 (2012), s. 297-311. ISSN 1878-5190. E-ISSN 1878-5204
R&D Projects: GA MŠMT(CZ) 1M0577
Grant - others:GA MPO(CZ) FR-TI3/242
Institutional support: RVO:61388955 ; RVO:67985858
Keywords : Photocatalysis * Titania * Azo dyes * Kinetics
OECD category: Physical chemistry; Physical chemistry (UCHP-M)
Impact factor: 1.104, year: 2012

Photocatalytic activities of a series of well available commercial TiO2 powders in both suspended and immobilized forms were determined by kinetic measurements of the degradation of acid orange 7 as model compound. Although the powders showed lower photoactivity in the immobilized than suspended form, the differences among particular materials considerably varied. The porosity of the photocatalysts and related adsorption/desorption phenomena strongly influence the photocatalytic degradations occurring in aqueous suspension. The adsorption of the azo dye has a significant effect on observed concentration changes during irradiation and must be taken in account in the evaluation of degradation rates in suspensions. No direct correlation between photocatalyst material properties and photoactivity was found. The paper brings a convincing discussion that, with only minor exceptions, it is not possible to form any general conclusions on the performance of a standard type photocatalyst, even if a model reactant is used.
Permanent Link: http://hdl.handle.net/11104/0279766