Photocatalytic activity of structured mesoporous TiO2 materials

Mercedes Alvaro, Carmela Aprile, Miriam Benitez, Esther Carbonell Llopis, Hermenegildo García

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

Starting from colloidal TiO2 nanoparticles in combination with tetraethyl orthosilicate using neutral Pluronic or cationic cetyltrimethylammonium as templates, a series of structured mesoporous silicas has been obtained. The structure of the mesoporous titania was confirmed by isothermal gas adsorption, transmission electron microscopy, and X-ray diffraction. The pore diameter ranged between 3.8 and 10.9 nm, and the BET surface area varied from 99 to 584 m2 g-1. The photocatalytic activity of these samples for the degradation of phenol in aqueous solution has been compared with that of standard P-25 TiO2. Even though the activity of these new mesostructured materials is lower that those found for P-25 TiO2, the turnover frequency of the photocatalytic activity (moles of phenol degraded per Ti atom present at initial reaction time) is much higher for the mesoporous titania, particularly with low titanium contents for those materials (mpTiO2-5 and TiO 2-SBA15-5).

langue originaleAnglais
Pages (de - à)6661-6665
Nombre de pages5
journalJournal of physical chemistry B
Volume110
Numéro de publication13
Les DOIs
Etat de la publicationPublié - 6 mai 2006

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