Silica-supported TiO2 powders were synthesized by a wet method under mild conditions. The aim of the work was the preparation of TiO2/SiO2 additives for photocatalytic cements. Three types of commercial SiO2 were used as supports: Cabot, Axim and Fly Ash. Cabot silica was ultra-pure whereas the other two 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 a solution of TiCl4 in water (volume ratio 1:10). The photocatalytic activity was evaluated in a gas–solid system both in batch and in continuous reactors using 2-propanol as probe molecule. SEM-EDX analysis revealed that titanium dioxide was quantitatively deposited on silica. TiO2/Axim and TiO2/Fly Ash were scarcely active whereas a good photoactivity was exhibited by the TiO2/Cabot sample both in the batch and in the continuous system. Consequently only the last sample was tested for both NOx abatement and for 4-nitrophenol photodegradation in a liquid–solid system.

Bellardita, M., Addamo, M., Di Paola, A., Marcì, G., Palmisano, L., Cassar, L., et al. (2010). Photocatalytic activity of TiO2/SiO2 systems. JOURNAL OF HAZARDOUS MATERIALS, 174, 707-713 [10.1016/j.jhazmat.2009.09.108].

Photocatalytic activity of TiO2/SiO2 systems

BELLARDITA, Marianna;ADDAMO, Maurizio;DI PAOLA, Agatino;MARCI', Giuseppe;PALMISANO, Leonardo;
2010-01-01

Abstract

Silica-supported TiO2 powders were synthesized by a wet method under mild conditions. The aim of the work was the preparation of TiO2/SiO2 additives for photocatalytic cements. Three types of commercial SiO2 were used as supports: Cabot, Axim and Fly Ash. Cabot silica was ultra-pure whereas the other two 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 a solution of TiCl4 in water (volume ratio 1:10). The photocatalytic activity was evaluated in a gas–solid system both in batch and in continuous reactors using 2-propanol as probe molecule. SEM-EDX analysis revealed that titanium dioxide was quantitatively deposited on silica. TiO2/Axim and TiO2/Fly Ash were scarcely active whereas a good photoactivity was exhibited by the TiO2/Cabot sample both in the batch and in the continuous system. Consequently only the last sample was tested for both NOx abatement and for 4-nitrophenol photodegradation in a liquid–solid system.
Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie
Settore ING-IND/23 - Chimica Fisica Applicata
Bellardita, M., Addamo, M., Di Paola, A., Marcì, G., Palmisano, L., Cassar, L., et al. (2010). Photocatalytic activity of TiO2/SiO2 systems. JOURNAL OF HAZARDOUS MATERIALS, 174, 707-713 [10.1016/j.jhazmat.2009.09.108].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/52908
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