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Sub-10-nm Mixed Titanium/Tantalum Oxide Nanoporous Films with Visible-Light Photocatalytic Activity for Water Treatment
journal contribution
posted on 2019-04-26, 00:00 authored by Andrea Merenda, Lingxue KongLingxue Kong, N Fahim, A Sadek, E L H Mayes, A Hawley, B Zhu, S R Gray, Ludovic DumeeCopyright © 2019 American Chemical Society. 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.
History
Journal
ACS Applied Nano MaterialsVolume
2Issue
4Pagination
1951 - 1963Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
eISSN
2574-0970Language
engPublication classification
C1 Refereed article in a scholarly journal; C Journal articleUsage metrics
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sub-10-nm nanotubesdoped titaniaO vacanciesband-gap engineeringcatalytic thin filmsScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials ScienceTITANIUM-DIOXIDE NANOMATERIALSTIO2 NANOTUBES SYNTHESISMETHYLENE-BLUETHIN-FILMSDOPED TIO2MECHANICAL-PROPERTIESNANOWIRE ARRAYSTA ALLOYSSURFACEDEGRADATION
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