Preparation and characterization of monometallic (Au) and bimetallic (Ag/Au) modified-titania photocatalysts activated by visible light
Abstrakt
The Au-TiO2 and Ag/Au-TiO2 nanoparticles have been prepared using a water-in-oil microemulsion system of water/AOT/cyclohexane and water/Triton X-100/cyclohexane. The obtained photocatalysts were subsequently characterized by a BET method, DRS spectroscopy, X-ray photoelectron emission spectroscopy (XPS), scanning transmission electron microscopy (STEM) and X-ray powder diffraction analysis (XRD). For gold-doped titanium (IV) oxide nanoparticles the effect of reducing agent and stabilizer on gold particles size and photocatalytic activity were observed. The effect of crystalline form of TiO2 and gold nanoparticles size on photocatalytic activity of Au-TiO2 and Ag/Au-TiO2 in visible light were also investigated. The photocatalytic activity of noble metals modified-TiO2 powders under visible light irradiation was estimated by measuring the decomposition rate of phenol in an aqueous solution. The best photocatalytic activity revealed samples with large gold particles (∼90 nm) deposited on small titania nanoparticles. It was also found that the bimetallic samples (Ag/Au-TiO2) showed a higher photodegradation rate in visible region than monometallic photocatalysts.
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Informacje szczegółowe
- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuł w czasopiśmie wyróżnionym w JCR
- Opublikowano w:
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APPLIED CATALYSIS B-ENVIRONMENTAL
nr 101,
strony 504 - 514,
ISSN: 0926-3373 - Język:
- angielski
- Rok wydania:
- 2011
- Opis bibliograficzny:
- Zielińska-Jurek A., Kowalska E., Sobczak J., Lisowski W., Ohtani B., Zaleska-Medynska A.: Preparation and characterization of monometallic (Au) and bimetallic (Ag/Au) modified-titania photocatalysts activated by visible light// APPLIED CATALYSIS B-ENVIRONMENTAL. -Vol. 101, nr. iss. 3-4 (2011), s.504-514
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.apcatb.2010.10.022
- Weryfikacja:
- Politechnika Gdańska
wyświetlono 243 razy
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