6533b822fe1ef96bd127d6a1

RESEARCH PRODUCT

Photocatalytic activity of TiO2/SiO2 systems

Leonardo PalmisanoGiuseppe MarcìM. AddamoA. Di PaolaBorsa MassimoMarianna BellarditaL. Cassar

subject

Environmental EngineeringPhotochemistryScanning electron microscopeHealth Toxicology and MutagenesisMineralogyCatalysisCatalysischemistry.chemical_compoundX-Ray DiffractionTiO2 SiO2 photocatalysisEnvironmental ChemistryPhotodegradationWaste Management and DisposalTitaniumChemistryContinuous reactorSilicon DioxidePollutionTitanium oxidePhotocatalysis TiO2/SiO2 systems Gas–solid reactions Photocatalytic cement Urban pollutionSettore ING-IND/23 - Chimica Fisica ApplicataFly ashTitanium dioxideMicroscopy Electron ScanningPhotocatalysisSettore CHIM/07 - Fondamenti Chimici Delle TecnologieNuclear chemistry

description

Silica-supported TiO(2) powders were synthesized by a wet method under mild conditions. The aim of the work was the preparation of TiO(2)/SiO(2) additives for photocatalytic cements. Three types of commercial SiO(2) 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 TiO(2)/SiO(2) samples, denoted TiO(2)/Cabot, TiO(2)/Axim and TiO(2)/Fly Ash, were prepared by boiling suspensions obtained by addition of silica to a solution of TiCl(4) 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. TiO(2)/Axim and TiO(2)/Fly Ash were scarcely active whereas a good photoactivity was exhibited by the TiO(2)/Cabot sample both in the batch and in the continuous system. Consequently only the last sample was tested for both NO(x) abatement and for 4-nitrophenol photodegradation in a liquid-solid system.

yearjournalcountryeditionlanguage
2009-06-17
10.1016/j.jhazmat.2009.09.108http://hdl.handle.net/10447/52908