The aim of the work was to study the influence of crystallinity and OH surface density on the pho-tocatalytic activity of two commercial and two home-prepared TiO2powders. The samples werecharacterized by X-ray diffraction (XRD), thermogravimetric analysis (TG) and electron paramagneticresonance (EPR) measurements. The photoactivity of the powders was tested employing the photodegra-dation of 4-nitrophenol (4-NP) and the selective oxidation of 4-methoxybenzyl alcohol (4-MBA) to4-methoxybenzaldehyde (p-anisaldehyde) under UV irradiation. An anti-correlation between oxidantpower and selectivity of the various samples was found. A higher rate of 4-NP degradation was exhibitedby 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-preparedpowders.
Di Paola, A., Bellardita, M., Palmisano, L., Barbierikovà, Z., Brezovà, V. (2014). Influence of crystallinity and OH surface density on the photocatalytic activity of TiO2 powders. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. A, CHEMISTRY, 273, 59-67 [10.1016/j.jphotochem.2013.09.008].
Influence of crystallinity and OH surface density on the photocatalytic activity of TiO2 powders
DI PAOLA, Agatino;BELLARDITA, Marianna;PALMISANO, Leonardo;
2014-01-01
Abstract
The aim of the work was to study the influence of crystallinity and OH surface density on the pho-tocatalytic activity of two commercial and two home-prepared TiO2powders. The samples werecharacterized by X-ray diffraction (XRD), thermogravimetric analysis (TG) and electron paramagneticresonance (EPR) measurements. The photoactivity of the powders was tested employing the photodegra-dation of 4-nitrophenol (4-NP) and the selective oxidation of 4-methoxybenzyl alcohol (4-MBA) to4-methoxybenzaldehyde (p-anisaldehyde) under UV irradiation. An anti-correlation between oxidantpower and selectivity of the various samples was found. A higher rate of 4-NP degradation was exhibitedby 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-preparedpowders.
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