Photocatalytic activity of TiO2/SiO2 systems

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Abstract

Silica-supported TiO2 powders were synthesized by a wet method under mild conditions. The aim of thework was the preparation of TiO2/SiO2 additives for photocatalytic cements. Three types of commercialSiO2 were used as supports: Cabot, Axim and Fly Ash. Cabot silica was ultra-pure whereas the othertwo silica contained different percentages of various oxides. The TiO2/SiO2 samples, denoted TiO2/Cabot,TiO2/Axim and TiO2/Fly Ash, were prepared by boiling suspensions obtained by addition of silica to asolution of TiCl4 in water (volume ratio 1:10). The photocatalytic activity was evaluated in a gas–solidsystem both in batch and in continuous reactors using 2-propanol as probe molecule. SEM-EDX analysisrevealed that titanium dioxide was quantitatively deposited on silica. TiO2/Axim and TiO2/Fly Ash werescarcely active whereas a good photoactivity was exhibited by the TiO2/Cabot sample both in the batchand in the continuous system. Consequently only the last sample was tested for both NOx abatement andfor 4-nitrophenol photodegradation in a liquid–solid system.
Lingua originaleEnglish
pagine (da-a)707-713
Numero di pagine7
RivistaJournal of Hazardous Materials
Volume174
Stato di pubblicazionePublished - 2010

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All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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