
Self-Organized TiO 2 Nanotube Arrays: Synthesis by Anodization in an Ionic Liquid and Assessment of Photocatalytic Properties
2011; American Chemical Society; Volume: 3; Issue: 4 Linguagem: Inglês
10.1021/am200156d
ISSN1944-8252
AutoresHeberton Wender, Adriano F. Feil, Leonardo B. Diaz, Camila Silva Ribeiro, Guilherme J. Machado, Pedro Migowski, Daniel E. Weibel, Jaı̈rton Dupont, Sérgio R. Teixeira,
Tópico(s)Anodic Oxide Films and Nanostructures
ResumoSelf-organized TiO(2) nanotube (NT) arrays were produced by anodization in ethylene glycol (EG) electrolytes containing 1-n-butyl-3-methyl-imidazolium tetrafluoroborate (BMI.BF(4)) ionic liquid and water. The morphology of the as-formed NTs was considerably affected by changing the anodization time, voltage, and water and ionic liquid electrolyte concentrations. In general, a nanoporous layer was formed on the top surface of the TiO(2) NTs, except for anodization at 100 V with 1 vol % of BMI.BF(4), where the NT's mouth was revealed. The length and bottom diameter of the NTs as well as the pore diameter of the top layer showed a linear relationship with increased anodization voltage. These TiO(2) NTs were tested as photocatalysts for methyl orange photodegradation and hydrogen evolution from water/methanol solutions by UV light irradiation. The results show that the TiO(2) NTs obtained by anodization in EG/H(2)O/BMI.BF(4) electrolytes are active and efficient for both applications.
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