Influence of crystallinity and OH surface density on the photocatalytic activity of TiO2 powders

被引：98
作者：
Di Paola, Agatino [1 ,2 ]
Bellardita, Marianna [1 ]
Palmisano, Leonardo [1 ,2 ]
Barbierikova, Zuzana [3 ]
Brezova, Vlasta [3 ]
机构：
[1] Univ Palermo, Schiavello Grillone Photocatalysis Grp, Dipartimento Energia Ingn Informaz & Modelli Mate, I-90128 Palermo, Italy
[2] Consorzio Interuniv Chim Ambiente, I-30175 Marghera, Italy
[3] Slovak Univ Technol Bratislava, Inst Phys Chem & Chem Phys, Fac Chem & Food Technol, SK-81237 Bratislava, Slovakia
来源：
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 2014年 / 273卷
关键词：
Photocatalysis; TiO2; Crystallinity; Surface OH-groups; EPR; TITANIUM(IV) OXIDE PARTICLES; SELECTIVE OXIDATION; AQUEOUS SUSPENSION; HYDROXYL CONTENT; PHENOL; DEGRADATION; DIOXIDE; ALCOHOLS; PHOTOREACTIVITY; NANOPARTICLES;
D O I：
10.1016/j.jphotochem.2013.09.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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页码：59 / 67
页数：9
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