A Non-Aqueous Synthesis of TiO2/SiO2 Composites in Supercritical CO2 for the Photodegradation of Pollutants

Authors

  • Jasper Jammaer,

    1. Centre for Surface Chemistry and Catalysis, Catholic University of Leuven, Kasteelpark Arenberg 23, 3001 Heverlee (Belgium)
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  • Prof. Carmela Aprile,

    Corresponding author
    1. Département de Chimie, Unité de Chimie des Nanomatériaux (UCNANO), Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, 5000 Namur (Belgium), Fax: (+32) 81 72 54 14
    2. Centre for Surface Chemistry and Catalysis, Catholic University of Leuven, Kasteelpark Arenberg 23, 3001 Heverlee (Belgium)
    • Département de Chimie, Unité de Chimie des Nanomatériaux (UCNANO), Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, 5000 Namur (Belgium), Fax: (+32) 81 72 54 14
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  • Sammy W. Verbruggen,

    1. Centre for Surface Chemistry and Catalysis, Catholic University of Leuven, Kasteelpark Arenberg 23, 3001 Heverlee (Belgium)
    2. Department Bioscience-Engineering, University of Antwerp, Middelheimcampus G.V. 609, Groenenborgerlaan 171, 2020 Antwerp (Belgium)
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  • Prof. Silvia Lenaerts,

    1. Department Bioscience-Engineering, University of Antwerp, Middelheimcampus G.V. 609, Groenenborgerlaan 171, 2020 Antwerp (Belgium)
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  • Prof. Paolo P. Pescarmona,

    1. Centre for Surface Chemistry and Catalysis, Catholic University of Leuven, Kasteelpark Arenberg 23, 3001 Heverlee (Belgium)
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  • Prof. Johan A. Martens

    Corresponding author
    1. Centre for Surface Chemistry and Catalysis, Catholic University of Leuven, Kasteelpark Arenberg 23, 3001 Heverlee (Belgium)
    • Centre for Surface Chemistry and Catalysis, Catholic University of Leuven, Kasteelpark Arenberg 23, 3001 Heverlee (Belgium)
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Abstract

Titania/silica composites with different Ti/Si ratios are synthesized via a nonconventional synthesis route. The synthesis involves non-aqueous reaction of metal alkoxides and formic acid at 75 °C in supercritical carbon dioxide. The as-prepared composite materials contain nanometer-sized anatase crystallites and amorphous silica. Large specific surface areas are obtained. The composites are evaluated in the photocatalytic degradation of phenol in aqueous medium, and in the elimination of acetaldehyde from air. The highest photocatalytic activity in both processes is achieved with a composite containing 40 wt % TiO2.

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