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 Photosensitization of TiO(2) by Ag(2)S and its catalytic activity on phenol photodegradation
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6261

title: Photosensitization of TiO(2) by Ag(2)S and its catalytic activity on phenol photodegradation
authors: Neves, M. C.
Nogueira, J. M. F.
Trindade, T.
Mendonca, M. H.
Pereira, M. I.
Monteiro, O. C.
keywords: Phenol
Photodegradation
TiO2/Ag2S
Photocatalysis
Photosensitizer
issue date: May-2009
publisher: Elsevier
abstract: A process of TiO2 photosensitization by coupling it with a narrow band gap semiconductor has been investigated here. Distinct TiO2/Ag2S nanocomposites were prepared by a single-source decomposition method. After sensitization, the TiO2 materials were evaluated as photocatalysts on the degradation of aqueous phenol solutions. The experimental results show that the nanocomposites photocatalytic activity is related with the existence of Ag2S over the TiO2 surface. The best catalytic results, for phenol photodegradation, were obtained using a TiO2/Ag2S material with a surface Ti/Ag atomic ratio equal to 2.40. With this material the complete photodegradation of a 0.20mM phenol solution was achieved within 90 min, which is considerably faster when compared with the use of TiO2. The occurrence of main degradation byproducts was also investigated.
URI: http://hdl.handle.net/10773/6261
ISSN: 1010-6030
publisher version/DOI: dx.doi.org/10.1016/j.jphotochem.2009.03.014
source: Journal Of Photochemistry And Photobiology A: Chemistry
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