Synthesis of nitrogen doped TiO2 by grinding in gaseous NH3

In Cheol Kang; Qiwu Zhang; Junya Kano; Shu Yin; Tsugio Sato; Fumio Saito

doi:10.1016/j.jphotochem.2007.02.003

Synthesis of nitrogen doped TiO₂ by grinding in gaseous NH₃

In Cheol Kang, Qiwu Zhang, Junya Kano, Shu Yin, Tsugio Sato, Fumio Saito

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

TiO₂ was ground in gaseous NH₃ by using a planetary mill to synthesize nitrogen doped TiO₂. Grinding induces phase transformation of TiO₂ from anatase to srilankite, srilankite to rutile in air at room temperature, whereas the phase transformation of TiO₂ is delayed by the grinding in gaseous NH₃. And, product ground under NH₃ has higher surface area than that of under air, and the heated product displays higher specific surface area than that of product without heating. Light-absorption edge of the products is shifted toward visible light wavelength with an increase in grinding period of time. The ground samples exhibit less photocatalytic activity evaluated by the decomposition of NO gas. This may be due to the existence of residual NH₃ and NH₄⁺ formed on TiO₂ surface, which prevents the contact of NO gas with TiO₂ surface. By removing these compositions by thermal treatment at 200 °C for 60 min in air, the photocatalytic activity is improved.

Original language	English
Pages (from-to)	232-238
Number of pages	7
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	189
Issue number	2-3
DOIs	https://doi.org/10.1016/j.jphotochem.2007.02.003
Publication status	Published - 2007 Jun 25

Keywords

Gaseous NH
Grinding
Nitrogen doping
TiO photocatalyst

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1016/j.jphotochem.2007.02.003

Cite this

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title = "Synthesis of nitrogen doped TiO2 by grinding in gaseous NH3",

abstract = "TiO2 was ground in gaseous NH3 by using a planetary mill to synthesize nitrogen doped TiO2. Grinding induces phase transformation of TiO2 from anatase to srilankite, srilankite to rutile in air at room temperature, whereas the phase transformation of TiO2 is delayed by the grinding in gaseous NH3. And, product ground under NH3 has higher surface area than that of under air, and the heated product displays higher specific surface area than that of product without heating. Light-absorption edge of the products is shifted toward visible light wavelength with an increase in grinding period of time. The ground samples exhibit less photocatalytic activity evaluated by the decomposition of NO gas. This may be due to the existence of residual NH3 and NH4+ formed on TiO2 surface, which prevents the contact of NO gas with TiO2 surface. By removing these compositions by thermal treatment at 200 °C for 60 min in air, the photocatalytic activity is improved.",

keywords = "Gaseous NH, Grinding, Nitrogen doping, TiO photocatalyst",

author = "Kang, {In Cheol} and Qiwu Zhang and Junya Kano and Shu Yin and Tsugio Sato and Fumio Saito",

note = "Funding Information: This work was supported by the Korea Science and Engineering Foundation Grant funded by the Korea government (MOST) (No. 2005-215-D00146)",

year = "2007",

month = jun,

day = "25",

doi = "10.1016/j.jphotochem.2007.02.003",

language = "English",

volume = "189",

pages = "232--238",

journal = "Journal of Photochemistry and Photobiology A: Chemistry",

issn = "1010-6030",

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number = "2-3",

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TY - JOUR

T1 - Synthesis of nitrogen doped TiO2 by grinding in gaseous NH3

AU - Kang, In Cheol

AU - Zhang, Qiwu

AU - Kano, Junya

AU - Yin, Shu

AU - Sato, Tsugio

AU - Saito, Fumio

N1 - Funding Information: This work was supported by the Korea Science and Engineering Foundation Grant funded by the Korea government (MOST) (No. 2005-215-D00146)

PY - 2007/6/25

Y1 - 2007/6/25

N2 - TiO2 was ground in gaseous NH3 by using a planetary mill to synthesize nitrogen doped TiO2. Grinding induces phase transformation of TiO2 from anatase to srilankite, srilankite to rutile in air at room temperature, whereas the phase transformation of TiO2 is delayed by the grinding in gaseous NH3. And, product ground under NH3 has higher surface area than that of under air, and the heated product displays higher specific surface area than that of product without heating. Light-absorption edge of the products is shifted toward visible light wavelength with an increase in grinding period of time. The ground samples exhibit less photocatalytic activity evaluated by the decomposition of NO gas. This may be due to the existence of residual NH3 and NH4+ formed on TiO2 surface, which prevents the contact of NO gas with TiO2 surface. By removing these compositions by thermal treatment at 200 °C for 60 min in air, the photocatalytic activity is improved.

AB - TiO2 was ground in gaseous NH3 by using a planetary mill to synthesize nitrogen doped TiO2. Grinding induces phase transformation of TiO2 from anatase to srilankite, srilankite to rutile in air at room temperature, whereas the phase transformation of TiO2 is delayed by the grinding in gaseous NH3. And, product ground under NH3 has higher surface area than that of under air, and the heated product displays higher specific surface area than that of product without heating. Light-absorption edge of the products is shifted toward visible light wavelength with an increase in grinding period of time. The ground samples exhibit less photocatalytic activity evaluated by the decomposition of NO gas. This may be due to the existence of residual NH3 and NH4+ formed on TiO2 surface, which prevents the contact of NO gas with TiO2 surface. By removing these compositions by thermal treatment at 200 °C for 60 min in air, the photocatalytic activity is improved.

KW - Gaseous NH

KW - Grinding

KW - Nitrogen doping

KW - TiO photocatalyst

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