6533b82efe1ef96bd1293185
RESEARCH PRODUCT
Influence of Adsorbed Water on the Activation Energy of Model Photocatalytic Reactions
Francesco ParrinoVito Armando LaudicinaVittorio LoddoC. De PasqualePellegrino ConteLeonardo Palmisanosubject
Inorganic chemistrySettore AGR/13 - Chimica Agraria02 engineering and technologyActivation energy010402 general chemistry01 natural sciencesRedoxchemistry.chemical_compoundAdsorptionPhenolMoleculePhysical and Theoretical ChemistryCatecholChemistrygreen chemistrytitanium dioxideSubstrate (chemistry)021001 nanoscience & nanotechnologyNMR0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsGeneral EnergyPhotocatalysisRelaxomatrySettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologycatalystdescription
Two commercial (Merck and Sigma-Aldrich) and two home prepared (HP05 and HP05C) powdered TiO2 photocatalysts were investigated by fast field cycling nuclear magnetic resonance experiments in order to explore the nature of the interactions between water and the solid surfaces. The results were related to the activation energies determined at temperatures ranging from 303 to 353 K for the photocatalytic oxidation in water of three model molecules presenting different interactions with the solid surface (catechol, phenol, and metylbenzoate). The photoactivity results at different temperatures were comparable to each other because the runs were carried out while keeping constant the concentration of O2 in the suspensions. The study highlights the influence of the adsorbed water on the activation energy of a photocatalytic reaction. In particular, we showed that competition between water and substrate adsorption is a determining factor in the activation energy of a photocatalytic oxidation reaction.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-01-19 |