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    Solvothermal synthesis and photocatalytic performance of Mg2+-doped anatase nanocrystals with exposed {0 0 1} facets

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    Access Status
    Open access
    Authors
    Sofianos, Veronica
    Tassi, M.
    Boukos, N.
    Thanos, S.
    Vaimakis, T.
    Yu, J.
    Trapalis, C.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Sofianos, V. and Tassi, M. and Boukos, N. and Thanos, S. and Vaimakis, T. and Yu, J. and Trapalis, C. 2014. Solvothermal synthesis and photocatalytic performance of Mg2+-doped anatase nanocrystals with exposed {0 0 1} facets. Catalysis Today. 230: pp. 125-130.
    Source Title
    Catalysis Today
    DOI
    10.1016/j.cattod.2013.11.022
    ISSN
    0920-5861
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/50355
    Collection
    • Curtin Research Publications
    Abstract

    The photocatalytic activity of TiO2 and magnesium doped TiO 2 nanocrystals in dopant range of 2-6.2 at%, was studied. The doped and undoped nanocrystals with exposed {0 0 1} crystal facets were synthesized by a solvothermal method. Several studies have shown that the (0 0 1) surface of the TiO2 anatase crystal is more reactive than the thermodynamically stable (1 0 1) surface. The crystal structure as well as the shape of the TiO2 and Mg2+/TiO2 anatase nanoparticles were determined using two different techniques, such as X-ray powder diffraction (XRD) and transmission electron microscopy (TEM), which both lead to the agreeable conclusion that the nanocrystals are in the form of plates. Chemical analysis of the photocatalyst was carried out with X-ray photoelectron spectroscopy (XPS) and showed the presence of magnesium ions in the TiO 2 nanoplates. UV-vis diffuse reflectance spectroscopy (DRS) showed that there is an adsorption shift for doped TiO2 to visible light region. The photocalaytic efficiency of the synthesized catalysts was investigated by the photocatalytic oxidation of the gaseous nitric oxide (NO) and decomposition of the gaseous acetaldehyde (CH3CHO) under UV irradiation. It was demonstrated that the low Mg2+ doped catalysts exhibited higher photocatalytic activity than the pure TiO2. The optimal concentration of dopant that is beneficial for the photocatalytic activity was studied. © 2013 Elsevier B.V.

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