6533b821fe1ef96bd127b035
RESEARCH PRODUCT
Influence of crystallinity and OH surface density on the photocatalytic activity of TiO2 powders
Zuzana BarbierikováAgatino Di PaolaMarianna BellarditaLeonardo PalmisanoVlasta Brezovásubject
Thermogravimetric analysisChemistryGeneral Chemical EngineeringGeneral Physics and AstronomyAlcoholPhotocatalysisTiO2CrystallinitySurface OH-groupsEPRaGeneral Chemistrytitanium dioxide EPR OH densitylaw.inventionchemistry.chemical_compoundCrystallinitylawPhotocatalysisOrganic chemistryIrradiationSettore CHIM/07 - Fondamenti Chimici Delle TecnologiePhotodegradationSelectivityElectron paramagnetic resonanceNuclear chemistrydescription
Abstract The aim of the work was to study the influence of crystallinity and OH surface density on the photocatalytic activity of two commercial and two home-prepared TiO 2 powders. The samples were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG) and electron paramagnetic resonance (EPR) measurements. The photoactivity of the powders was tested employing the photodegradation of 4-nitrophenol (4-NP) and the selective oxidation of 4-methoxybenzyl alcohol (4-MBA) to 4-methoxybenzaldehyde ( p -anisaldehyde) under UV irradiation. An anti-correlation between oxidant power and selectivity of the various samples was found. A higher rate of 4-NP degradation was exhibited by the most crystalline commercial samples, whereas the highest selectivity toward the synthesis of p -anisaldehyde was obtained in the presence of the least crystalline and most hydroxylated home-prepared powders.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 |