Preparation of visible-light-responsive TiO2-xNx photocatalyst by a sol-gel method: Analysis of the active center on TiO 2 that reacts with NH3

Yasushige Kuroda, Toshinori Mori, Kazunori Yagi, Naoko Makihata, Yoichiro Kawahara, Mahiko Nagao, Shigeharu Kittaka

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

Active reaction centers for ammonia on titanium oxyhydroxide were explored to direct the search for an efficient sol-gel method for the synthesis of a titanium oxynitride (TiO2-xNx) sample with an efficient responsiveness to the visible light constituting a main part of the solar spectrum. The results lead to the conclusion that the site giving IR bands at around 2195 cm-1 for the adsorbed CO molecules at 300 K is a reactive site and behaves as Lewis acid site in the coordination environment of distorted five-coordinate Ti4+ ions. Ammonia molecules are adsorbed on such a site to form -NH2 and -OH species during the heat treatments at a temperature above 373 K, and they are ultimately incorporated into the TiO2 lattice as nitride through the dehydration at higher temperatures of up to 723 K, resulting in the formation of an anatase type of TiO2-xNx.

Original languageEnglish
Pages (from-to)8026-8034
Number of pages9
JournalLangmuir
Volume21
Issue number17
DOIs
Publication statusPublished - Aug 16 2005

Fingerprint

Photocatalysts
Titanium
Ammonia
Sol-gel process
ammonia
titanium
gels
Lewis Acids
preparation
Molecules
solar spectra
oxynitrides
Carbon Monoxide
Dehydration
Nitrides
dehydration
anatase
Titanium dioxide
nitrides
molecules

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Preparation of visible-light-responsive TiO2-xNx photocatalyst by a sol-gel method : Analysis of the active center on TiO 2 that reacts with NH3. / Kuroda, Yasushige; Mori, Toshinori; Yagi, Kazunori; Makihata, Naoko; Kawahara, Yoichiro; Nagao, Mahiko; Kittaka, Shigeharu.

In: Langmuir, Vol. 21, No. 17, 16.08.2005, p. 8026-8034.

Research output: Contribution to journalArticle

Kuroda, Yasushige ; Mori, Toshinori ; Yagi, Kazunori ; Makihata, Naoko ; Kawahara, Yoichiro ; Nagao, Mahiko ; Kittaka, Shigeharu. / Preparation of visible-light-responsive TiO2-xNx photocatalyst by a sol-gel method : Analysis of the active center on TiO 2 that reacts with NH3. In: Langmuir. 2005 ; Vol. 21, No. 17. pp. 8026-8034.
@article{e8af192f82354685b1fd112b458e481d,
title = "Preparation of visible-light-responsive TiO2-xNx photocatalyst by a sol-gel method: Analysis of the active center on TiO 2 that reacts with NH3",
abstract = "Active reaction centers for ammonia on titanium oxyhydroxide were explored to direct the search for an efficient sol-gel method for the synthesis of a titanium oxynitride (TiO2-xNx) sample with an efficient responsiveness to the visible light constituting a main part of the solar spectrum. The results lead to the conclusion that the site giving IR bands at around 2195 cm-1 for the adsorbed CO molecules at 300 K is a reactive site and behaves as Lewis acid site in the coordination environment of distorted five-coordinate Ti4+ ions. Ammonia molecules are adsorbed on such a site to form -NH2 and -OH species during the heat treatments at a temperature above 373 K, and they are ultimately incorporated into the TiO2 lattice as nitride through the dehydration at higher temperatures of up to 723 K, resulting in the formation of an anatase type of TiO2-xNx.",
author = "Yasushige Kuroda and Toshinori Mori and Kazunori Yagi and Naoko Makihata and Yoichiro Kawahara and Mahiko Nagao and Shigeharu Kittaka",
year = "2005",
month = "8",
day = "16",
doi = "10.1021/la0508792",
language = "English",
volume = "21",
pages = "8026--8034",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "17",

}

TY - JOUR

T1 - Preparation of visible-light-responsive TiO2-xNx photocatalyst by a sol-gel method

T2 - Analysis of the active center on TiO 2 that reacts with NH3

AU - Kuroda, Yasushige

AU - Mori, Toshinori

AU - Yagi, Kazunori

AU - Makihata, Naoko

AU - Kawahara, Yoichiro

AU - Nagao, Mahiko

AU - Kittaka, Shigeharu

PY - 2005/8/16

Y1 - 2005/8/16

N2 - Active reaction centers for ammonia on titanium oxyhydroxide were explored to direct the search for an efficient sol-gel method for the synthesis of a titanium oxynitride (TiO2-xNx) sample with an efficient responsiveness to the visible light constituting a main part of the solar spectrum. The results lead to the conclusion that the site giving IR bands at around 2195 cm-1 for the adsorbed CO molecules at 300 K is a reactive site and behaves as Lewis acid site in the coordination environment of distorted five-coordinate Ti4+ ions. Ammonia molecules are adsorbed on such a site to form -NH2 and -OH species during the heat treatments at a temperature above 373 K, and they are ultimately incorporated into the TiO2 lattice as nitride through the dehydration at higher temperatures of up to 723 K, resulting in the formation of an anatase type of TiO2-xNx.

AB - Active reaction centers for ammonia on titanium oxyhydroxide were explored to direct the search for an efficient sol-gel method for the synthesis of a titanium oxynitride (TiO2-xNx) sample with an efficient responsiveness to the visible light constituting a main part of the solar spectrum. The results lead to the conclusion that the site giving IR bands at around 2195 cm-1 for the adsorbed CO molecules at 300 K is a reactive site and behaves as Lewis acid site in the coordination environment of distorted five-coordinate Ti4+ ions. Ammonia molecules are adsorbed on such a site to form -NH2 and -OH species during the heat treatments at a temperature above 373 K, and they are ultimately incorporated into the TiO2 lattice as nitride through the dehydration at higher temperatures of up to 723 K, resulting in the formation of an anatase type of TiO2-xNx.

UR - http://www.scopus.com/inward/record.url?scp=33645823604&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33645823604&partnerID=8YFLogxK

U2 - 10.1021/la0508792

DO - 10.1021/la0508792

M3 - Article

C2 - 16089416

AN - SCOPUS:33645823604

VL - 21

SP - 8026

EP - 8034

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 17

ER -