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    Photocatalytic properties of TiO2 and Fe-doped TiO2 prepared by metal organic framework-mediated synthesis

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    Valero et al.pdf
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    Type
    Article
    Authors
    Valero-Romero, M.J. cc
    Santaclara, J.G.
    Oar-Arteta, L.
    van Koppen, L.
    Osadchii, D.Y.
    Gascon, Jorge cc
    Kapteijn, Freek cc
    KAUST Department
    Chemical Engineering Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2018-11-19
    Online Publication Date
    2018-11-19
    Print Publication Date
    2019-03
    Permanent link to this record
    http://hdl.handle.net/10754/630154
    
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    Abstract
    The Ti-containing metal organic framework (MOF) MIL-125 has been used as sacrificial precursor to obtain TiO2 materials through the MOF-mediated synthesis route. In this study, Fe3+ was deposited on the surface of MIL-125 after its hydrothermal synthesis. Targeted Fe-doped titania photocatalysts were prepared through the direct calcination in air of Fe/MIL-125 crystals and/or by using a two-step method, including carbonization in inert atmosphere followed by calcination in air. The relationship between the synthesis conditions and the properties of the Fe-doped titania nanopowders, such as Fe content, porosity, phase composition and particle size was investigated. From elemental mapping, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, UV–Vis absorption spectroscopy and photoluminescence emission spectra, the presence of highly dispersed Fe3+ ions incorporated into the TiO2 crystal lattice was confirmed, which led to a significant red shift of photoresponse towards visible light and reduced the recombination rate of electron-hole pairs at low iron content. By varying the pre-carbonization temperature, both crystal size and phase composition in the final materials were modulated. The performance of Fe-doped titania materials in photocatalytic water-splitting was tested for hydrogen evolution. Optimal photocatalytic performance was found at 0.15 and 0.5 wt. % iron concentration and exceeded those of non-doped titania and commercial anatase both under visible and UV light irradiation, respectively, and among the highest reported in literature for these systems.
    Citation
    Valero-Romero MJ, Santaclara JG, Oar-Arteta L, van Koppen L, Osadchii DY, et al. (2019) Photocatalytic properties of TiO2 and Fe-doped TiO2 prepared by metal organic framework-mediated synthesis. Chemical Engineering Journal 360: 75–88. Available: http://dx.doi.org/10.1016/j.cej.2018.11.132.
    Sponsors
    The authors would like to thank ADREM (EU Horizon 2020 call SPIRE-05-2015) for financial support. We are grateful to the ESRF (beamline BM23) where we performed the XAS measurements. We also want to thank to Bart van der Linden from Delft for all his support with the photocatalytic set up.
    Publisher
    Elsevier BV
    Journal
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2018.11.132
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S1385894718323660
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.cej.2018.11.132
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; KAUST Catalysis Center (KCC)

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