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Physicochemical Study of Photocatalytic Activity of TiO2Supported Palygorskite Clay Mineral

Bouna, Lahcen and Rhouta, Benaïssa and Maury, Francis Physicochemical Study of Photocatalytic Activity of TiO2Supported Palygorskite Clay Mineral. (2013) International Journal of Photoenergy, 2013. 1-6. ISSN 1110-662X

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Official URL: http://dx.doi.org/10.1155/2013/815473

Abstract

This study deals with the influence of physicochemical parameters, namely, the photocatalyst loading, dye concentration, and pH of polluted solutions, on the degradation efficiency of Orange G (OG) solutions containing TiO2 nanoparticles supported on palygorskite clay mineral (TiO2-Pal). The TiO2 photocatalyst attached to natural palygorskite fibers was elaborated by colloidal solgel route. It exhibits the anatase structure that is themost photoactive crystallographic form.The highest performances of supported photocatalyst on OG degradation were found using an optimumamount of TiO2-Pal around 0.8 g⋅L−1, which corresponds properly to ca. 0.4 g⋅L−1 of TiO2.This amount is interestingly lower than the 2.5 g⋅L−1 generally reported when using pure unsupported TiO2 powder.The photodegradation rate increases by decreasing OG initial concentration, and it was found significantly higher when the OG solution is either acidic (pH < 4) or basic (pH ≈ 11). For OG concentrations in the range 5 × 10 −6–5 × 10 −4 M, the kinetic law of the OG degradation in presence of TiO2-Pal is similar to that reported for unsupported TiO2 nanopowder. It follows a Langmuir-Hinshelwood model with a first-order reaction and an apparent rate constant of about 2.9 × 10 −2 min−1.

Item Type:Article
Additional Information:Thanks to Hindawi Publishing Corporation editor. The original PDF of the article can be found at International Journal of Photoenergy website : http://www.hindawi.com/journals/ijp/
HAL Id:hal-01170216
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 Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > University of Cadi Ayyad - UCAM (MOROCCO)
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Deposited By: cirimat webmestre
Deposited On:01 Jul 2015 08:50

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