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Persistent deNOx Ability of CaAl2O4:(Eu, Nd)/TiO2-xNy Luminescent Photocatalyst.

Li H, Yin S, Sato T - Nanoscale Res Lett (2010)

Bottom Line: CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst was successfully synthesized by a simple planetary ball milling process.It was found that CaAl2O4:(Eu, Nd)/TiO2-xNy composites provided the luminescence to persist photocatalytic reaction for more than 3 h after turning off the light.GRAPHICAL CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst with persistent deNOx activity after turning off the light was successfully synthesized by a simple planetary ball milling process.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohuko University, 2-1-1 Katahira, Sendai, Aoba-ku Japan. shuyin@tagen.tohoku.ac.jp.

ABSTRACT
CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst was successfully synthesized by a simple planetary ball milling process. Improvement of photocatalytic deNOx ability of TiO2-xNy, together with the persistent photocatalytic activity for the decomposition of NO after turning off the light were realized, by coupling TiO2-xNy with long afterglow phosphor, CaAl2O4:(Eu, Nd). The novel persistent photocatalytic behavior was related to the overlap between the absorption wavelength of TiO2-xNy and the emission wavelength of the CaAl2O4:(Eu, Nd). It was found that CaAl2O4:(Eu, Nd)/TiO2-xNy composites provided the luminescence to persist photocatalytic reaction for more than 3 h after turning off the light. GRAPHICAL CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst with persistent deNOx activity after turning off the light was successfully synthesized by a simple planetary ball milling process. The novel persistent photocatalytic behavior was related to the overlap between the absorption wavelength of TiO2-xNy and the emission wavelength of the CaAl2O4:(Eu, Nd).

No MeSH data available.


Overlap of diffuse reflectance spectra of a undoped TiO2(P25) and b TiO2-xNy and c emission spectrum of CaAl2O4:(Eu, Nd).
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Figure 1: Overlap of diffuse reflectance spectra of a undoped TiO2(P25) and b TiO2-xNy and c emission spectrum of CaAl2O4:(Eu, Nd).

Mentions: Figure 1 shows the diffuse reflectance spectra of undoped and nitrogen-doped titania and the emission spectrum of CaAl2O4:(Eu, Nd). CaAl2O4:(Eu, Nd) emitted blue luminescent light with a peak of 440 nm in wavelength by UV light irradiation (325 nm). Although undoped titania absorbed only UV light of the wavelength less than 400 nm, nitrogen–doped titania showed absorption of visible light up to 700 nm showing a nice overlap between the diffuse reflectance spectrum of TiO2-xNy and the emission spectrum of CaAl2O4:(Eu, Nd). Therefore, it implied the potential possibility of CaAl2O4:(Eu, Nd)/TiO2-xNy composite as the luminescent assisted photocatalyst which use the long after glow from the phosphor as the light source of the photocatalyst. Our previous research proved that nitrogen doped titania could be induced the photocatalytic activity by such weak LED light as 2.0 mW/cm2 with long wavelength of 627 nm [23,24]. This result also strongly implied the potential application of the composite as luminescent assisted photocatalyst material.


Persistent deNOx Ability of CaAl2O4:(Eu, Nd)/TiO2-xNy Luminescent Photocatalyst.

Li H, Yin S, Sato T - Nanoscale Res Lett (2010)

Overlap of diffuse reflectance spectra of a undoped TiO2(P25) and b TiO2-xNy and c emission spectrum of CaAl2O4:(Eu, Nd).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3102338&req=5

Figure 1: Overlap of diffuse reflectance spectra of a undoped TiO2(P25) and b TiO2-xNy and c emission spectrum of CaAl2O4:(Eu, Nd).
Mentions: Figure 1 shows the diffuse reflectance spectra of undoped and nitrogen-doped titania and the emission spectrum of CaAl2O4:(Eu, Nd). CaAl2O4:(Eu, Nd) emitted blue luminescent light with a peak of 440 nm in wavelength by UV light irradiation (325 nm). Although undoped titania absorbed only UV light of the wavelength less than 400 nm, nitrogen–doped titania showed absorption of visible light up to 700 nm showing a nice overlap between the diffuse reflectance spectrum of TiO2-xNy and the emission spectrum of CaAl2O4:(Eu, Nd). Therefore, it implied the potential possibility of CaAl2O4:(Eu, Nd)/TiO2-xNy composite as the luminescent assisted photocatalyst which use the long after glow from the phosphor as the light source of the photocatalyst. Our previous research proved that nitrogen doped titania could be induced the photocatalytic activity by such weak LED light as 2.0 mW/cm2 with long wavelength of 627 nm [23,24]. This result also strongly implied the potential application of the composite as luminescent assisted photocatalyst material.

Bottom Line: CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst was successfully synthesized by a simple planetary ball milling process.It was found that CaAl2O4:(Eu, Nd)/TiO2-xNy composites provided the luminescence to persist photocatalytic reaction for more than 3 h after turning off the light.GRAPHICAL CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst with persistent deNOx activity after turning off the light was successfully synthesized by a simple planetary ball milling process.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Multidisciplinary Research for Advanced Materials, Tohuko University, 2-1-1 Katahira, Sendai, Aoba-ku Japan. shuyin@tagen.tohoku.ac.jp.

ABSTRACT
CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst was successfully synthesized by a simple planetary ball milling process. Improvement of photocatalytic deNOx ability of TiO2-xNy, together with the persistent photocatalytic activity for the decomposition of NO after turning off the light were realized, by coupling TiO2-xNy with long afterglow phosphor, CaAl2O4:(Eu, Nd). The novel persistent photocatalytic behavior was related to the overlap between the absorption wavelength of TiO2-xNy and the emission wavelength of the CaAl2O4:(Eu, Nd). It was found that CaAl2O4:(Eu, Nd)/TiO2-xNy composites provided the luminescence to persist photocatalytic reaction for more than 3 h after turning off the light. GRAPHICAL CaAl2O4:(Eu, Nd)/TiO2-xNy composite luminescent photocatalyst with persistent deNOx activity after turning off the light was successfully synthesized by a simple planetary ball milling process. The novel persistent photocatalytic behavior was related to the overlap between the absorption wavelength of TiO2-xNy and the emission wavelength of the CaAl2O4:(Eu, Nd).

No MeSH data available.