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Title: Modulating the photocatalytic activity of TiO2 (P25) with lanthanum and graphene oxide
Authors: Lais Coelho, Leticya
Hotza, Dachamir
Senra Estrella, Arthur
de Amorim, Suelen M.
Li Puma, Gianluca
Moreira, Regina F.P.M.
Keywords: Titanium dioxide
Graphene oxide
Rare earths
Lanthanides
Issue Date: 2018
Publisher: © Elsevier
Citation: LAIS COELHO, L. ... et al, 2018. Modulating the photocatalytic activity of TiO2 (P25) with lanthanum and graphene oxide. Journal of Photochemistry and Photobiology A: Chemistry, 372, pp.1-10.
Abstract: The modulation and tuning of the photocatalytic activity of commercial titanium dioxide (TiO2) P25 nanoparticles is demonstrated through the incorporation of lanthanum (La) and/or graphene oxide (GO). These composite materials, which could have applications in commercial products, were prepared by a two-step hydrothermal method from the corresponding precursors. The effect of La (0.05–2 mol%) and GO (5 m%) content on the crystal structure, morphology and photocatalytic activity of TiO2 was investigated by XRS, SEM, EDS, TEM, UV–vis DRS, point of zero charge, photoluminescence and the decolorization of methylene blue. Lanthanum modified the recombination rate of the photogenerated electron-hole charges on TiO2 by inducing an increase in the structural defects, which resulted in a significant suppression, up to 90%, of the photocatalytic activity in the UVA light region. In contrast, the addition of GO enhanced the photocatalytic activity of TiO2. Materials with tuned intermediate photoactivity within the entire range from high to very low were prepared by dosing appropriate amounts of La and GO species. The strategy of combining La and GO represents a useful and simple method for tuning or for suppressing the photocatalytic activity of TiO2 under UVA light irradiation in materials and consumer products using TiO2.
Description: This paper is closed access until 30 November 2019.
Sponsor: The authors gratefully acknowledge the Brazilian funding agencies CAPES and CNPq (Grant 405892/2013-6 and 304397/2010-5) for financial support.
Version: Accepted for publication
DOI: 10.1016/j.jphotochem.2018.11.048
URI: https://dspace.lboro.ac.uk/2134/36545
Publisher Link: https://doi.org/10.1016/j.jphotochem.2018.11.048
ISSN: 1010-6030
Appears in Collections:Closed Access (Chemical Engineering)

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