Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 273, Issue -, Pages 59-67Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2013.09.008
Keywords
Photocatalysis; TiO2; Crystallinity; Surface OH-groups; EPR
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Funding
- Scientific Grant Agency of the Slovak Republic [1/0289/12]
- Ministero dell'Istruzione, dell'UniversitA e della Ricerca, Italy [PON01_02257]
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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 TiO2 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. (C) 2013 Elsevier B.V. All rights reserved.
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