Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 217, Issue 2-3, Pages 275-283Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2010.10.020
Keywords
Photocatalysis; Sulphated TiO2; Photodeposition; Phenol oxidation; Metal dispersion; Pt-TiO2; Au-TiO2; Pd-TiO2
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Funding
- Spanish MinisterioCiencia e Innovacion [CTQ2008-05961-CO2-01]
- Junta de Andalucia [P06-FQM-1406]
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A comparative study of the photodeposition of Pt, Au and Pd under the same experimental conditions onto pre-sulphated and non-sulphated TiO2 was performed. Morphological and surface characterisation of the samples as well as photocatalytic activity for phenol photooxidation was studied. The influence of sulphate pre-treatment on the deposits size and dispersion onto the TiO2 surface, and photodeposition yields with the different metals were also analysed. The photocatalytic activity of the doped materials was then investigated, observing that catalytic behaviour can be correlated to physical characteristics of the samples determined by (XRD) X-ray diffraction, (XPS) X-ray photoelectron spectroscopy, (XRF) X-ray fluorescence spectrometry and (TEM) transmission electron microscopy. Sulphate pre-treatment was found to influence both the level of dispersion and the size of metal clusters on the TiO2 surface. Sulphation and metallisation of samples was found to produce a synergistic enhancement in photoactivity for the degradation of phenol. The photoactivity of the catalysts with respect to the doped metal species was ordered Pt > Pd > Au. (C) 2010 Elsevier B.V. All rights reserved.
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