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|title: ||Photosensitization of TiO(2) by Ag(2)S and its catalytic activity on phenol photodegradation|
|authors: ||Neves, M. C.|
Nogueira, J. M. F.
Mendonca, M. H.
Pereira, M. I.
Monteiro, O. C.
|issue date: ||May-2009|
|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.|
|publisher version/DOI: ||dx.doi.org/10.1016/j.jphotochem.2009.03.014|
|source: ||Journal Of Photochemistry And Photobiology A: Chemistry|
|appears in collections||DQ - Artigos|
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