Single atom Cu(I) promoted mesoporous titanias for photocatalytic Methyl Orange depollution and H2production

Rima Trofimovaite, Christopher M.A. Parlett, Santosh Kumar, Lucia Frattini, Mark A. Isaacs, Karen Wilson, Luca Olivi, Ben Coulson, Joyashish Debgupta, Richard E. Douthwaite, Adam F. Lee

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    Abstract

    © 2018 Elsevier B.V. Tailoring the physicochemical properties and hence reactivity of semiconductor photocatalysts in a predictable fashion, remains a challenge to their industrial application. Here we demonstrate the striking promotional effect of incorporating single Cu(I) atoms, on aqueous phase photocatalytic dye degradation and H2production over surfactant-templated mesoporous TiO2. X-ray absorption spectroscopy reveals that ultra-low concentrations of copper (0.02–0.1 wt%) introduced into the mesoporous TiO2surface create isolated Cu (I) species which suppress charge recombination, and confer a six-fold photocatalytic promotion of Methyl Orange degradation and four-fold enhancement of H2evolution. The impact of mesopore structure and photophysical properties on photocatalytic activity is also quantified for the first time: calcination increases mesopore size and nanocrystalline order, and induces an anatase to rutile phase transition that is accompanied by a decrease in the optical band gap, increased charge carrier lifetime, and a concomitant significant activity enhancement.
    Original languageEnglish
    Pages (from-to)501-511
    Number of pages11
    JournalApplied Catalysis B: Environmental
    Volume232
    Early online date22 Mar 2018
    DOIs
    Publication statusPublished - 15 Sept 2018

    Keywords

    • Copper
    • Mesoporous
    • Photocatalysis
    • Titania
    • XAS

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