Details

Autor(en) / Beteiligte

• Parrino, F
• Conte, P
• De Pasquale, C
• Laudicina, V. A
• Loddo, V
• Palmisano, L

Titel

Influence of Adsorbed Water on the Activation Energy of Model Photocatalytic Reactions

Ist Teil von

• Journal of physical chemistry. C, 2017-02, Vol.121 (4), p.2258-2267

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.