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Enhancement of photocatalytic activity of titania-titanate nanotubes by surface modification

Title
Enhancement of photocatalytic activity of titania-titanate nanotubes by surface modification
Authors
Kim, SoonhyunKim, MinsunHwang, Sung-HoLim, Sang Kyoo
DGIST Authors
Kim, SoonhyunHwang, Sung-HoLim, Sang Kyoo
Issue Date
2012-07-23
Citation
Applied Catalysis B: Environmental, 123, 391-397
Type
Article
Article Type
Article
Keywords
Acid TreatmentsAcidic ConditionsAromatic CompoundsBET Surface AreaCrystalline MaterialsCrystalline PhaseCrystalline PhasisDegradationElongated NanostructureFluorineHigh Surface AreaHydrothermal ReactionHydrothermallyMethylene BlueNanoparticlesNanotube StructureNanotubesPhase TransitionsPhoto-Catalytic ActivitiesPhotocatalysisSpherical NanoparticlesSurface-ModifiedSurface ModificationSurface TreatmentTitanate NanotubesTitaniaTitania NanoparticlesTitania PhaseTitanium Dioxide
ISSN
0926-3373
Abstract
Hydrothermally prepared titanate nanotubes are known to be thermodynamically unstable and to be easily transformed to the titania phase by heat or acid treatment, which is accompanied by the destruction of the nanotube structures. Surface modification of titanate nanotubes is expected to retard the phase-transition reactions from titanate nanotubes to titania nanoparticles. In this study, we investigated the effects of surface modifications, such as fluorination or phosphation, on the phase-transition reactions of hydrothermally prepared titanate nanotubes under acidic conditions. After acid treatment, surface-modified titanate nanotubes maintained their nanotube structures, and spherical nanoparticles were partially formed in the titanate nanotubes. Unmodified titanate nanotubes, however, changed to elongated nanostructures and spherical nanoparticles. The surface modifications also strongly affected the crystalline phases and increased the BET surface area. The photocatalytic activities for methylene blue degradation and gaseous CH 3CHO oxidation were strongly enhanced by the surface modifications. These effects were attributed to the anatase crystalline phase and the high surface area. Therefore, these surface modifications are useful methods to improve the photocatalytic activities of titanate nanotubes. © 2012 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/5354
DOI
10.1016/j.apcatb.2012.05.008
Publisher
Elsevier B.V.
Related Researcher
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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