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The influence of preparation method on the physicochemical properties of titania–silica aerogels

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Abstract

A series of titania–silica aerogels with different compositions were prepared using four different preparation methods. The preparation steps were followed by a high temperature supercritical drying (HTSCD). It was found that application of ethanol and 2-propanol as the solvents for the titania precursor (with or without modification with acetyloacetone) resulted in materials with BET surface area up to 990 m2/g, total pore volume up to 5.6 cm3/g and density as low as 0.041 g cm−3. Obtained aerogels were mesoporous materials with the average pore diameter in the range 11–27 nm. It was stated that application of the I method (prehydrolysis) resulted in aerogels with higher average pore diameter than other preparation methods while aerogels with the lowest average pore diameter were obtained using the so-called IV, impregnation method. Anatase form of titania was found in all prepared samples. The prepared aerogels were being applied as catalysts in photodegradation of salicylic acid solution in water. The obtained results suggest a much higher catalytic efficiency of titania, which is present in aerogel than it is in the case of commercial P25 Degussa titanium dioxide.

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Acknowledgments

This work was supported by Polish Ministry of Scientific Research and Information Technology (Project no. 3 T09B 03 228) and Bilateral Scientific Cooperation between Wroclaw University of Technology and Flemish Institute for Technological Research.

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Authors and Affiliations

  1. Department of Fuels Chemistry and Technology, Wroclaw University of Technology, ul. Gdanska 7/9, Wroclaw, 50-344, Poland

    Krzysztof Brodzik, Jerzy Walendziewski & Marek Stolarski

  2. Flemish Institute for Technological Research VITO, Boeretang 200, Mol, 2400, Belgium

    Luc Van Ginneken & Kathy Elst

  3. Laboratory of Adsorption and Catalysis, Chemistry Department, University of Antwerp, Universiteitsplein 1, Antwerpen, 2610, Belgium

    Vera Meynen

Authors
  1. Krzysztof Brodzik
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  2. Jerzy Walendziewski
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  3. Marek Stolarski
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  4. Luc Van Ginneken
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  5. Kathy Elst
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  6. Vera Meynen
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Correspondence to Jerzy Walendziewski.

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Brodzik, K., Walendziewski, J., Stolarski, M. et al. The influence of preparation method on the physicochemical properties of titania–silica aerogels. J Porous Mater 14, 219–226 (2007). https://doi.org/10.1007/s10934-006-9027-9

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  • DOI: https://doi.org/10.1007/s10934-006-9027-9

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