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Synthesis, characterization and photocatalytic activity of TiO2 supported natural palygorskite microfibers

Bouna, Lahcen and Rhouta, Benaïssa and Amjoud, M'barek and Maury, Francis and Lafont, Marie-Christine and Jada, Amane and Senocq, François and Daoudi, Lahcen Synthesis, characterization and photocatalytic activity of TiO2 supported natural palygorskite microfibers. (2011) Applied Clay Science, vol. 52 (n° 3). pp. 301-311. ISSN 0169-1317

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Official URL: http://dx.doi.org/10.1016/j.clay.2011.03.009

Abstract

This study deals with the synthesis of TiO2 supported Moroccan palygorskite fibers and their use as photocatalyst for the removal of Orange G pollutant from wastewater. The TiO2-palygorskite nanocomposite synthesis was accomplished according to a colloidal route involving a cationic surfactant as template (hexadecyltrimethylammonium bromide) assuring hence organophilic environment for the formation of TiO2 nanoparticles. The clay minerals samples were characterized before and after functionalization with TiO2. Anatase crystallizes above ca. 450 °C and remarkably remains stable up to 900 °C. In contrast, pure TiO2 xerogel obtained from titanium tetraisopropoxide (TTIP) showed before calcination a nanocrystalline structure of anatase. By increasing the temperature, anatase readily transforms into rutile beyond 600 °C. The remarkable stability at high temperature of anatase particles immobilized onto palygorskite microfibers was due to the hindrance of particles growth by sintering. Homogeneous monodisperse distribution of anatase particles with an average size of 8 nm was found by TEM and XRD onto palygorskite fibers. This anatase particle size remains below the nucleus critical size (ca. 11 nm) required for anatase–rutile transition. The TiO2 supported palygorskite sample annealed in air at 600 °C for 1 h exhibits the highest photocatalytic activity towards the degradation of Orange G compared to nanocomposite samples prepared under different conditions as well as pure TiO2 powders obtained from the xerogel route or commercially available as Degussa P25.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original version is available at http://www.sciencedirect.com The original PDF of the article can be found at Applied Clay Science website:http://www.sciencedirect.com/science/article/pii/S0169131711001025
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > University of Cadi Ayyad - UCAM (MOROCCO)
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Deposited By: Denis Faragou
Deposited On:06 Jun 2012 20:36

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