Sub-10-nm Mixed Titanium/Tantalum Oxide Nanoporous Films with Visible-Light Photocatalytic Activity for Water Treatment

  • Andrea Merenda*
    Andrea Merenda
    Institute for Frontier Materials, Deakin University, Waurn Ponds, Geelong, 3216 Victoria, Australia
    *E-mail: [email protected] (A.M.).
  • Lingxue Kong
    Lingxue Kong
    Institute for Frontier Materials, Deakin University, Waurn Ponds, Geelong, 3216 Victoria, Australia
    More by Lingxue Kong
  • Narges Fahim
    Narges Fahim
    Institute for Frontier Materials, Deakin University, Waurn Ponds, Geelong, 3216 Victoria, Australia
    More by Narges Fahim
  • Abu Sadek
    Abu Sadek
    Institute of Biotechnology, Melbourne Center for Nanofabrication (MCN), 151 Wellington Road, Clayton, 3168 Victoria, Australia
    More by Abu Sadek
  • Edwin L. H. Mayes
    Edwin L. H. Mayes
    RMIT Microscopy and Microanalysis Facility, RMIT University, G.P.O. Box 2476, Melbourne, 3001 Victoria, Australia
  • Adrian Hawley
    Adrian Hawley
    Australian Synchrotron, ANSTO, Clayton, 3168 Victoria, Australia
  • Bo Zhu
    Bo Zhu
    Institute for Sustainable Industries & Liveable Cities, VU Research, Victoria University, P.O. Box 14428, Melbourne, 8001 Victoria, Australia
    More by Bo Zhu
  • Stephen R. Gray
    Stephen R. Gray
    Institute for Sustainable Industries & Liveable Cities, VU Research, Victoria University, P.O. Box 14428, Melbourne, 8001 Victoria, Australia
  • , and 
  • Ludovic F. Dumée*
    Ludovic F. Dumée
    Institute for Frontier Materials, Deakin University, Waurn Ponds, Geelong, 3216 Victoria, Australia
    *E-mail: [email protected] (L.F.D.).
Cite this: ACS Appl. Nano Mater. 2019, 2, 4, 1951–1963
Publication Date (Web):March 6, 2019
https://doi.org/10.1021/acsanm.8b02350
Copyright © 2019 American Chemical Society
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Abstract

In the present work, anodic mixed titanium/tantalum oxide nanotubes are prepared for the first time with sub-10-nm surface pore size and tube inner diameter. The morphological changes induced by the introduction of Ta into the Ti metal matrix are investigated, leading to remarkable geometrical variations dependent on the Ta loading. The UV-light activation necessary to trigger electron transfer in TiO2 limits the range of applications, and the shift in light absorption toward the visible range represents a significant challenge. Here, the band gaps of the as-created nanotube thin-film arrays are calculated, and the results, showing the presence of a minimum in the band gap, correlated to the presence of titanium and tantalum suboxides and Ta loading. The potential of the thin films as advanced materials for photocatalytic water treatment is tested against that of pure TiO2, and an enhancement in the visible-light absorption and an almost 3-fold increase in the degradation kinetics under pure visible-light irradiation are demonstrated.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsanm.8b02350.

  • As-deposited Ti–Ta thin films, AFM micrographs of as-deposited Ti–Ta films, 3D surface texture parameters of as-deposited Ti–Ta films, anodized Ti–Ta alloys, inset of nanotubes emerging from surface fractures or cracks, SAXS scattering curves, SAXS modeling parameters, schematic of scattering features assigned to the nanotubes, combined SEM and SAXS analysis, elemental composition of as-deposited Ti–Ta films and anodized films calculated by XPS analysis, XPS analysis of the as-sputtered Ti−Ta alloy core level, XPS depth-profiling elemental composition for Ti, Ta, and the Ta/Ti ratio for anodized Ti−Ta alloys, XRD analysis of as-deposited Ti–Ta alloy thin films, XRD analysis of an anodized Ti–Ta alloy, Kubelka–Munk function and Tauc plot, Tauc plot calculations, XPS HR spectra of Ti 2p, Ta 4f, and Ti 2p, O 1s, and Ta 4f for TiO2 and TiO2 (22.5 at. % Ta), Langmuir–Hinselwood model, kinetic constants for zero-order and apparent first-order reactions calculated for a series of anodized TiO2–Ta, and cyclability analysis on the TiO2 (17.4 at. % Ta) sample upon degradation of MB (PDF)

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This article is cited by 7 publications.

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