Nitrification of Nb-Modified Titanias Prepared by the Solvothermal Method and their Photocatalytic Activities under Visible-Light Irradiation

Shinnosuke Noguchi; Toru Tokutome; Shinji Iwamoto

doi:10.4028/www.scientific.net/KEM.596.43

Paper Titles

Electrical Properties of SnS Films Deposited by Thermal Evaporation of Sulfurized Sn Powder
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Improvement of Photovoltage in Dye-Sensitized Solar Cells with Azobenzene and Azulene Sensitizing Dyes by Applying Br₃^-/Br^- Redox Mediator
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Nitrification of Nb-Modified Titanias Prepared by the Solvothermal Method and their Photocatalytic Activities under Visible-Light Irradiation
p.43

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 596Nitrification of Nb-Modified Titanias Prepared by...

Nitrification of Nb-Modified Titanias Prepared by the Solvothermal Method and their Photocatalytic Activities under Visible-Light Irradiation

Abstract:

Niobium modified titania samples were prepared by thermal reaction of titanium tetraisopropoxide and niobium pentaethoxide in 1,4-butanediol at 300 °C (solvothermal method), and the products were nitrified in an NH₃ flow at 600 °C. The physicochemical property of the thus-obtained N-and Nb-co-doped titanias and visible-light response photocatalytic activity of FeO_x-loaded N-and Nb-co-doped titanias were investigated. The N-and Nb-co-doped titanias had larger absorptions in the visible-light range as compared to the only N-doped titania samples. In ESR spectra of the Nb-modified TiO₂ samples annealed at 300 °C after the nitrification, signals due to Ti³⁺ and oxygen vacancies, which accelerate the recombination of the photo-generated electrons and holes, were clearly observed. On the other hand, for the N-and Nb-co-doped titanias annealed at 500 °C, the signals due to Ti³⁺ and oxygen vacancies decreased significantly. Actually, the FeO_x-loaded N-and Nb-co-doped samples annealed at 500 °C exhibited a higher photocatalytic activity for a photocatalytic decomposition of acetaldehyde under visible-light irradiation.

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Key Engineering Materials (Volume 596)

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43-49

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https://doi.org/10.4028/www.scientific.net/KEM.596.43

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December 2013

Authors:

Shinnosuke Noguchi, Toru Tokutome, Shinji Iwamoto

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Nb-Modified TiO₂, Nitrification, Photocatalyst

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