Limits...
Preparation, characterization and photocatalytic behavior of WO3-fullerene/TiO2 catalysts under visible light.

Meng ZD, Zhu L, Choi JG, Park CY, Oh WC - Nanoscale Res Lett (2011)

Bottom Line: The composite obtained was characterized by BET surface area measurements, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy, and UV-vis analysis.Excellent photocatalytic degradation of a MO solution was observed using the WO3-fullerene, fullerene-TiO2, and WO3-fullerene/TiO2 composites under visible light.An increase in photocatalytic activity was observed, and WO3-fullerene/TiO2 has the best photocatalytic activity; it may attribute to the increase of the photo-absorption effect by the fullerene and the cooperative effect of the WO3.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Advanced Materials Science & Engineering, Hanseo University, Seosan, Chungnam, 356-706, South Korea. wc_oh@hanseo.ac.kr.

ABSTRACT
WO3-treated fullerene/TiO2 composites (WO3-fullerene/TiO2) were prepared using a sol-gel method. The composite obtained was characterized by BET surface area measurements, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy, and UV-vis analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. Excellent photocatalytic degradation of a MO solution was observed using the WO3-fullerene, fullerene-TiO2, and WO3-fullerene/TiO2 composites under visible light. An increase in photocatalytic activity was observed, and WO3-fullerene/TiO2 has the best photocatalytic activity; it may attribute to the increase of the photo-absorption effect by the fullerene and the cooperative effect of the WO3.

No MeSH data available.


UV-vis absorption spectra of photocatalysts.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211879&req=5

Figure 5: UV-vis absorption spectra of photocatalysts.

Mentions: The UV-vis absorption spectra of the samples are shown in Figure 5; the illustration is UV-vis absorption spectra of pure TiO2. We can find that TiO2, WO3-fullerene, fullerene-TiO2, and WO3-fullerene/TiO2 composites have great absorption at ultraviolet region, but the absorption edge of TiO2 is approximately 400 nm (Eg = 3.2 eV). When at the visible region, WO3-fullerene, fullerene/TiO2, and WO3-fullerene-TiO2 composites have good absorption; this is also means that these composites have great photocatalytic activity under visible light irradiation. Because WO3 has a relatively small band gap (2.6 eV to approximately 3.0 eV), WO3 have photocatalytic activity at visible region, from the wavelength at 400 to 443 nm. And fullerene also acted as a photosensitizer, so that WO3-fullerene has good adsorption at visible region. In the case of fullerene-coupled TiO2, fullerene acted as a photosensitizer, which could be excited to inject electrons into the conduction band of TiO2. Because of the synergistic reaction of WO3, fullerene, and TiO2, the adsorption effect of WO3-fullerene/TiO2 is good at visible region [25,26].


Preparation, characterization and photocatalytic behavior of WO3-fullerene/TiO2 catalysts under visible light.

Meng ZD, Zhu L, Choi JG, Park CY, Oh WC - Nanoscale Res Lett (2011)

UV-vis absorption spectra of photocatalysts.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211879&req=5

Figure 5: UV-vis absorption spectra of photocatalysts.
Mentions: The UV-vis absorption spectra of the samples are shown in Figure 5; the illustration is UV-vis absorption spectra of pure TiO2. We can find that TiO2, WO3-fullerene, fullerene-TiO2, and WO3-fullerene/TiO2 composites have great absorption at ultraviolet region, but the absorption edge of TiO2 is approximately 400 nm (Eg = 3.2 eV). When at the visible region, WO3-fullerene, fullerene/TiO2, and WO3-fullerene-TiO2 composites have good absorption; this is also means that these composites have great photocatalytic activity under visible light irradiation. Because WO3 has a relatively small band gap (2.6 eV to approximately 3.0 eV), WO3 have photocatalytic activity at visible region, from the wavelength at 400 to 443 nm. And fullerene also acted as a photosensitizer, so that WO3-fullerene has good adsorption at visible region. In the case of fullerene-coupled TiO2, fullerene acted as a photosensitizer, which could be excited to inject electrons into the conduction band of TiO2. Because of the synergistic reaction of WO3, fullerene, and TiO2, the adsorption effect of WO3-fullerene/TiO2 is good at visible region [25,26].

Bottom Line: The composite obtained was characterized by BET surface area measurements, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy, and UV-vis analysis.Excellent photocatalytic degradation of a MO solution was observed using the WO3-fullerene, fullerene-TiO2, and WO3-fullerene/TiO2 composites under visible light.An increase in photocatalytic activity was observed, and WO3-fullerene/TiO2 has the best photocatalytic activity; it may attribute to the increase of the photo-absorption effect by the fullerene and the cooperative effect of the WO3.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Advanced Materials Science & Engineering, Hanseo University, Seosan, Chungnam, 356-706, South Korea. wc_oh@hanseo.ac.kr.

ABSTRACT
WO3-treated fullerene/TiO2 composites (WO3-fullerene/TiO2) were prepared using a sol-gel method. The composite obtained was characterized by BET surface area measurements, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy, and UV-vis analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. Excellent photocatalytic degradation of a MO solution was observed using the WO3-fullerene, fullerene-TiO2, and WO3-fullerene/TiO2 composites under visible light. An increase in photocatalytic activity was observed, and WO3-fullerene/TiO2 has the best photocatalytic activity; it may attribute to the increase of the photo-absorption effect by the fullerene and the cooperative effect of the WO3.

No MeSH data available.