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Effects of Amount of Si Addition and Annealing Treatment on the Photocatalytic Activities of N- and Si-Codoped Titanias under Visible-Light Irradiation.

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Title: Effects of Amount of Si Addition and Annealing Treatment on the Photocatalytic Activities of N- and Si-Codoped Titanias under Visible-Light Irradiation.
Authors: Hirotaka Ozaki1, Shinji Iwamoto1, Masashi Inoue1
Source: Industrial & Engineering Chemistry Research. Apr2008, Vol. 47 Issue 7, p2287-2293. 7p.
Subjects: Photocatalysis, Titanium group, Titanium, Irradiation
Abstract: Silicon-modified titanias prepared by thermal reactions of mixtures of titanium tetraisopropoxide and tetraethyl orthosilicate with various ratios in 1,4-butanediol at 300 °C (glycothermal reaction) were calcined at 500 °C in air, treated in an NH3flow at 600 °C for 1 h, and then annealed in air at different temperatures. The properties of the thus-obtained nitrified Si-modified titanias were characterized by UV−vis diffuse reflectance spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption, and electron spin resonance. The products had absorptions in the visible-light region and exhibited photocatalytic activities for decomposition of acetaldehyde under visible-light irradiation. It was found that the amount of Si modification significantly affected the amount of doped nitrogen and the visible-light-induced photocatalytic activity. Higher annealing temperature (500 °C) decreased the population of oxygen vacancies and increased photocatalytic activity in spite of the fact that the amount of doped nitrogen was reduced by the annealing at that temperature. The Si-modified titania with Si/Ti ratio of 0.3, nitrified at 600 °C for 1 h and annealed at 500 °C, exhibited the highest photocatalytic activities. [ABSTRACT FROM AUTHOR]
Copyright of Industrial & Engineering Chemistry Research is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 32792984
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PubTypeId: academicJournal
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  Data: Effects of Amount of Si Addition and Annealing Treatment on the Photocatalytic Activities of N- and Si-Codoped Titanias under Visible-Light Irradiation.
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  Data: <searchLink fieldCode="AR" term="%22Hirotaka+Ozaki%22">Hirotaka Ozaki</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shinji+Iwamoto%22">Shinji Iwamoto</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Masashi+Inoue%22">Masashi Inoue</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Industrial+%26+Engineering+Chemistry+Research%22">Industrial & Engineering Chemistry Research</searchLink>. Apr2008, Vol. 47 Issue 7, p2287-2293. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Photocatalysis%22">Photocatalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Titanium+group%22">Titanium group</searchLink><br /><searchLink fieldCode="DE" term="%22Titanium%22">Titanium</searchLink><br /><searchLink fieldCode="DE" term="%22Irradiation%22">Irradiation</searchLink>
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  Label: Abstract
  Group: Ab
  Data: Silicon-modified titanias prepared by thermal reactions of mixtures of titanium tetraisopropoxide and tetraethyl orthosilicate with various ratios in 1,4-butanediol at 300 °C (glycothermal reaction) were calcined at 500 °C in air, treated in an NH3flow at 600 °C for 1 h, and then annealed in air at different temperatures. The properties of the thus-obtained nitrified Si-modified titanias were characterized by UV−vis diffuse reflectance spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption, and electron spin resonance. The products had absorptions in the visible-light region and exhibited photocatalytic activities for decomposition of acetaldehyde under visible-light irradiation. It was found that the amount of Si modification significantly affected the amount of doped nitrogen and the visible-light-induced photocatalytic activity. Higher annealing temperature (500 °C) decreased the population of oxygen vacancies and increased photocatalytic activity in spite of the fact that the amount of doped nitrogen was reduced by the annealing at that temperature. The Si-modified titania with Si/Ti ratio of 0.3, nitrified at 600 °C for 1 h and annealed at 500 °C, exhibited the highest photocatalytic activities. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Industrial & Engineering Chemistry Research is the property of American Chemical Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1021/ie070971o
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 2287
    Subjects:
      – SubjectFull: Photocatalysis
        Type: general
      – SubjectFull: Titanium group
        Type: general
      – SubjectFull: Titanium
        Type: general
      – SubjectFull: Irradiation
        Type: general
    Titles:
      – TitleFull: Effects of Amount of Si Addition and Annealing Treatment on the Photocatalytic Activities of N- and Si-Codoped Titanias under Visible-Light Irradiation.
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            NameFull: Hirotaka Ozaki
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            NameFull: Shinji Iwamoto
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              Text: Apr2008
              Type: published
              Y: 2008
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              Value: 08885885
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              Value: 47
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