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Photocatalytic degradation of an azo-dye on TiO2/ activated carbon composite material

Andriantsiferana, Caroline and Mohamed, Elham Farouk and Delmas, Henri Photocatalytic degradation of an azo-dye on TiO2/ activated carbon composite material. (2014) Environmental Technology, vol. 35 (n° 3). pp. 355-363. ISSN 0959-3330

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Official URL: http://dx.doi.org/10.1080/09593330.2013.828094

Abstract

A sequential adsorption/photocatalytic regeneration process to remove tartrazine, an azo-dye in aqueous solution, has been investigated. The aim of this work was to compare the effectiveness of an adsorbent/photocatalyst composite – TiO2 deposited onto activated carbon (AC) – and a simple mixture of powders of TiO2 and AC in same proportion. The composite was an innovative material as the photocatalyst, TiO2, was deposited on the porous surface of a microporous-AC using metal-organic chemical vapour deposition in fluidized bed. The sequential process was composed of two-batch step cycles: every cycle alternated a step of adsorption and a step of photocatalytic oxidation under ultra-violet (365 nm), at 25◦C and atmospheric pressure. Both steps, adsorption and photocatalytic oxidation, have been investigated during four cycles. For both materials, the cumulated amounts adsorbed during four cycles corresponded to nearly twice themaximumadsorption capacities qmax proving the photocatalytic oxidation to regenerate the adsorbent. Concerning photocatalytic oxidation, the degree of mineralization was higher with the TiO2/AC composite: for each cycle, the value of the total organic carbon removal was 25% higher than that obtained with the mixture powder. These better photocatalytic performances involved better regeneration than higher adsorbed amounts for cycles 2, 3 and 4. Better performances with this promising material – TiO2 deposited onto AC – compared with TiO2 powder could be explained by the vicinity of photocatalytic and AC adsorption sites.

Item Type:Article
Additional Information:Thanks to Taylor & Francis editor. The definitive version is available online at: http://www.tandfonline.com/doi/abs/10.1080/09593330.2013.828094
HAL Id:hal-01153077
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Other partners > National Research Center - NRC (Egypt)
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Deposited By: Vincent GERBAUD
Deposited On:21 Oct 2013 14:49

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