Preparation and characterization of monometallic (Au) and bimetallic (Ag/Au) modified-titania photocatalysts activated by visible light

Anna Zielińska-Jurek; Ewa Kowalska; Janusz W. Sobczak; Wojciech Lisowski; Bunsho Ohtani; Adriana Zaleska-Medynska

doi:10.1016/j.apcatb.2010.10.022

Preparation and characterization of monometallic (Au) and bimetallic (Ag/Au) modified-titania photocatalysts activated by visible light

Abstract

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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Authors (6)

Anna Zielińska-Jurek prof. dr hab. inż.
Ewa Kowalska
Janusz W. Sobczak
Wojciech Lisowski
Bunsho Ohtani
Adriana Zaleska-Medynska prof. dr hab. inż.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: APPLIED CATALYSIS B-ENVIRONMENTAL no. 101, pages 504 - 514,
ISSN: 0926-3373
Language:: English
Publication year:: 2011
Bibliographic description:: 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:: Digital Object Identifier (open in new tab) 10.1016/j.apcatb.2010.10.022
Verified by:: Gdańsk University of Technology