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Synthesis and highly visible-induced photocatalytic activity of CNT-CdSe composite for methylene blue solution.

Chen ML, Oh WC - Nanoscale Res Lett (2011)

Bottom Line: Carbon nanotube-cadmium selenide (CNT-CdSe) composite was synthesized by a facile hydrothermal method derived from multi-walled carbon nanotubes as a stating material.The as-prepared products were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectrophotometer.The as-synthesized CNT-CdSe composite efficiently catalyzed the photodegradation of methylene blue in aqueous solutions under visible-light irradiation, exhibiting higher photocatalytic activity.

View Article: PubMed Central - HTML - PubMed

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

ABSTRACT
Carbon nanotube-cadmium selenide (CNT-CdSe) composite was synthesized by a facile hydrothermal method derived from multi-walled carbon nanotubes as a stating material. The as-prepared products were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectrophotometer. The as-synthesized CNT-CdSe composite efficiently catalyzed the photodegradation of methylene blue in aqueous solutions under visible-light irradiation, exhibiting higher photocatalytic activity.

No MeSH data available.


MWCNTs acting an electron acceptor for improving the photocatalytic activity of CdSe compound.
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Figure 10: MWCNTs acting an electron acceptor for improving the photocatalytic activity of CdSe compound.

Mentions: According to the above experimental data, the CNT-CdSe composite has an excellent photocatalytic activity toward the photodegradation of MB solution under visible-light irradiation. Figure 10 shows the MWCNTs acting an electron acceptor for improving the photocatalytic activity of CdSe compound. Under irradiation by visible lamp, the MWCNTs acting as good electron acceptors can accept the electrons by light irradiation [31,32]. Meanwhile, the CdSe can be also excited to produce the electrons and holes in the conduction band (CB) and valence band of CdSe. Then the electrons accepted by MWCNTs from light can transfer into the CB of CdSe, thereby increasing the number of electrons as well as the rate of electron-induced redox reactions. The generated electrons (e-) probably react with dissolved oxygen molecules and produce oxygen peroxide radical O2•-, the positive charged hole (h+) may react with the OH- derived from H2O to form hydroxyl radical OH•. The MB molecule then can be photocatalytically degraded by oxygen peroxide radical O2•- and hydroxyl radical OH• to CO2, H2O, and other mineralization [31-34].


Synthesis and highly visible-induced photocatalytic activity of CNT-CdSe composite for methylene blue solution.

Chen ML, Oh WC - Nanoscale Res Lett (2011)

MWCNTs acting an electron acceptor for improving the photocatalytic activity of CdSe compound.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211492&req=5

Figure 10: MWCNTs acting an electron acceptor for improving the photocatalytic activity of CdSe compound.
Mentions: According to the above experimental data, the CNT-CdSe composite has an excellent photocatalytic activity toward the photodegradation of MB solution under visible-light irradiation. Figure 10 shows the MWCNTs acting an electron acceptor for improving the photocatalytic activity of CdSe compound. Under irradiation by visible lamp, the MWCNTs acting as good electron acceptors can accept the electrons by light irradiation [31,32]. Meanwhile, the CdSe can be also excited to produce the electrons and holes in the conduction band (CB) and valence band of CdSe. Then the electrons accepted by MWCNTs from light can transfer into the CB of CdSe, thereby increasing the number of electrons as well as the rate of electron-induced redox reactions. The generated electrons (e-) probably react with dissolved oxygen molecules and produce oxygen peroxide radical O2•-, the positive charged hole (h+) may react with the OH- derived from H2O to form hydroxyl radical OH•. The MB molecule then can be photocatalytically degraded by oxygen peroxide radical O2•- and hydroxyl radical OH• to CO2, H2O, and other mineralization [31-34].

Bottom Line: Carbon nanotube-cadmium selenide (CNT-CdSe) composite was synthesized by a facile hydrothermal method derived from multi-walled carbon nanotubes as a stating material.The as-prepared products were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectrophotometer.The as-synthesized CNT-CdSe composite efficiently catalyzed the photodegradation of methylene blue in aqueous solutions under visible-light irradiation, exhibiting higher photocatalytic activity.

View Article: PubMed Central - HTML - PubMed

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

ABSTRACT
Carbon nanotube-cadmium selenide (CNT-CdSe) composite was synthesized by a facile hydrothermal method derived from multi-walled carbon nanotubes as a stating material. The as-prepared products were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectrophotometer. The as-synthesized CNT-CdSe composite efficiently catalyzed the photodegradation of methylene blue in aqueous solutions under visible-light irradiation, exhibiting higher photocatalytic activity.

No MeSH data available.