Single atom Cu(I) promoted mesoporous titanias for photocatalytic Methyl Orange depollution and H2 production

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

doi:10.1016/j.apcatb.2018.03.078

Single atom Cu(I) promoted mesoporous titanias for photocatalytic Methyl Orange depollution and H₂ production

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^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

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 H₂ production 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 TiO₂ surface 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 H₂ evolution. 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 language	English
Pages (from-to)	501-511
Number of pages	11
Journal	APPLIED CATALYSIS B-ENVIRONMENTAL
Volume	232
Early online date	22 Mar 2018
DOIs	https://doi.org/10.1016/j.apcatb.2018.03.078
Publication status	Published - 15 Sept 2018

Bibliographical note

Keywords

Copper
Mesoporous
Photocatalysis
Titania
XAS

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10.1016/j.apcatb.2018.03.078

Cu meso-TiO2 Applied Catalysis B author accepted manuscript
© Elsevier, 2018. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.
Accepted author manuscript, 1.3 MBLicence: CC BY-NC-ND

Cite this

Trofimovaite, R., Parlett, C. M. A., Kumar, S., Frattini, L., Isaacs, M. A., Wilson, K., Olivi, L., Coulson, B., Debgupta, J., Douthwaite, R. E., & Lee, A. F. (2018). Single atom Cu(I) promoted mesoporous titanias for photocatalytic Methyl Orange depollution and H₂ production. APPLIED CATALYSIS B-ENVIRONMENTAL, 232, 501-511. https://doi.org/10.1016/j.apcatb.2018.03.078

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