Synthesis and Performance of TiO 2 /Fly Ash Cenospheres as a Catalytic Film in a Novel Type of Periodic Air-Sparged Photocatalytic Reactor

The results of a photocatalytic process performed in a new type of inclined, three-phase fluidised bed reactor with a periodic photocatalyst film are presented. These phases were fly ash cenospheres coated with TiO , an aqueous solution of methylene blue and an air stream passing from the bottom of...

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Bibliographic Details
Published inMaterials Vol. 13; no. 7
Main Authors Żukowski, Witold, Migas, Przemysław, Bradło, Dariusz, Dulian, Piotr
Format Journal Article
LanguageEnglish
Published Switzerland 04.04.2020
Subjects
catalytic film
photocatalytic reaction
titanium dioxide
cenospheres
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Summary:The results of a photocatalytic process performed in a new type of inclined, three-phase fluidised bed reactor with a periodic photocatalyst film are presented. These phases were fly ash cenospheres coated with TiO , an aqueous solution of methylene blue and an air stream passing from the bottom of the photoreactor. The cenospheres have a density lower than water and could thus form a catalytic film on a top irradiated window. The formed surface film is stable but is easy to break and be reproduced in a cyclic air-sparged process. Mixing was performed in either a cyclic or a continuous manner. From an operational point of view, the best variant of mixing was a 10 s air-sparge/10 s break with a 50% duty cycle, because it provided the same discolouration efficiency and reduced energy demand by 50% in comparison with the continuous mixing. Due to film formation, the proposed catalytic reactor enables a substantial reduction in the energy required for mixing while maintaining the desired degree of discolouration.
ISSN:1996-1944
1996-1944