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Title

NO photooxidation with TiO2 photocatalysts modified with gold and platinum

AuthorsHernández Rodríguez, M. J.; Pulido Melián, E.; García Santiago, D.; González Díaz, O.; Navío, José Antonio CSIC ORCID; Doña Rodríguez, J. M.
KeywordsAu
Photocatalysis
TiO2
Pt
NOx
Issue Date15-May-2017
PublisherElsevier
CitationApplied Catalysis B - Environmental 205: 148-157 (2017)
AbstractIn this study, a comparative analysis is made of TiO modified with Pt or Au in NO photoxidation under different radiation and humidity conditions. The metals were deposited on the TiO surface using two methods, photodeposition and chemical reduction. All catalysts were supported on borosilicate 3.3 plates using a dip-coating technique. These modified photocatalysts were characterized by X-ray diffraction analysis (XRD), UV–vis diffuse reflectance spectra (DRS), Brunauer-Emmett-Teller measurements (BET), transmission electron microscopy (TEM) and X-ray photoelectron spectrum analysis (XPS). It was found from the XPS results that Pt and oxidized Pt species coexist on the samples obtained by photodeposition and chemical reduction. In the case of Au, though other oxidation states were also detected the dominant oxidation state for both catalysts is Au. TEM results showed most Au-C particles are below 5 nm, whereas for Au-P the nanoparticles are slightly bigger. With UV irradiation, the Pt modified catalysts do not show any significant improvement in NO photocatalytic oxidation in comparison with the unmodified P25. For Au, both modified photocatalysts (Au-P and Au-C) exceed the photocatalytic efficiency of the unmodified P25, with Au-C giving slightly better results. The incorporation of metals on the TiO increases its activity in the visible region.
Publisher version (URL)https://doi.org/10.1016/j.apcatb.2016.12.006
URIhttp://hdl.handle.net/10261/191296
DOI10.1016/j.apcatb.2016.12.006
ISSN0926-3373
Appears in Collections:(ICMS) Artículos

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