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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.


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Schematic diagram of the separation of photogenerated electrons and holes on the WO3-fullerene/TiO2 interface.
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Figure 8: Schematic diagram of the separation of photogenerated electrons and holes on the WO3-fullerene/TiO2 interface.

Mentions: Fullerene-TiO2 has a better degradation effect than pure TiO2 because fullerene is an energy sensitizer that improves the quantum efficiency and increases charge transfer [28,29]. The TiO2 deposited on the fullerene surface can retain its photodegradation activity. In the fullerene-coupled TiO2 system, the photocatalytic activities were enhanced mainly due to the high efficiency of charge separation induced by the synergistic effect of fullerene and TiO2. In the case of fullerene-coupled TiO2, hole and electron pairs were generated and separated on the interface of fullerene by visible light irradiation. The level of the conduction band in TiO2 was lower than the reduction potential of fullerene. Therefore, the photogenerated electron can transfer easily from the conduction band of fullerene to a TiO2 molecule with an interaction between fullerene and TiO2. Simultaneously, the holes in the valence band (VB) of TiO2 can transfer directly to fullerene because the VB of TiO2 matches well with fullerene. The synergistic effect fullerene and TiO2 both promoted the separation efficiency of the photogenerated electron-hole pairs, resulting in the high photocatalytic activity of fullerene-hybridized TiO2 samples. In this case, the fullerene-coupled TiO2 system improved the reaction state [30-32]. Therefore, the fullerene-coupled TiO2 has photocatalytic activity under visible light. Figure 8 shows a schematic diagram of the separation of photogenerated electrons and holes on the fullerene-TiO2 interface.


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)

Schematic diagram of the separation of photogenerated electrons and holes on the WO3-fullerene/TiO2 interface.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 8: Schematic diagram of the separation of photogenerated electrons and holes on the WO3-fullerene/TiO2 interface.
Mentions: Fullerene-TiO2 has a better degradation effect than pure TiO2 because fullerene is an energy sensitizer that improves the quantum efficiency and increases charge transfer [28,29]. The TiO2 deposited on the fullerene surface can retain its photodegradation activity. In the fullerene-coupled TiO2 system, the photocatalytic activities were enhanced mainly due to the high efficiency of charge separation induced by the synergistic effect of fullerene and TiO2. In the case of fullerene-coupled TiO2, hole and electron pairs were generated and separated on the interface of fullerene by visible light irradiation. The level of the conduction band in TiO2 was lower than the reduction potential of fullerene. Therefore, the photogenerated electron can transfer easily from the conduction band of fullerene to a TiO2 molecule with an interaction between fullerene and TiO2. Simultaneously, the holes in the valence band (VB) of TiO2 can transfer directly to fullerene because the VB of TiO2 matches well with fullerene. The synergistic effect fullerene and TiO2 both promoted the separation efficiency of the photogenerated electron-hole pairs, resulting in the high photocatalytic activity of fullerene-hybridized TiO2 samples. In this case, the fullerene-coupled TiO2 system improved the reaction state [30-32]. Therefore, the fullerene-coupled TiO2 has photocatalytic activity under visible light. Figure 8 shows a schematic diagram of the separation of photogenerated electrons and holes on the fullerene-TiO2 interface.

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.


Related in: MedlinePlus