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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.


XRD patterns of MWCNTs, CdSe, and CNT-CdSe composite.
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Figure 2: XRD patterns of MWCNTs, CdSe, and CNT-CdSe composite.

Mentions: Figure 2 shows X-ray patterns of the pristine MWNTs, CdSe, and CNT-CdSe composite. From Figure 2, it can be seen that the diffractogram of pure MWCNTs exhibit the typical peaks at 25.9° and 42.7°, corresponding to the graphite (002) and (100) reflections (Joint Committee for Powder Diffraction Studies (JCPDS) No. 01-0646) [28], respectively. For CdSe compound, the XRD diffraction peaks around 2θ of 25.4°, 42°, and 50°, which can be indexed to the characteristic peaks (111), (220), and (311) plane reflections of cubic crystal structure CdSe with lattice constants of 6.05 Å according to the standard powder diffraction data (JCPDS No. 65-2891 for CdSe, cubic) [29,30]. However, for CNT-CdSe composite, only the typical peaks arose from CdSe were detected. As we known, CdSe has three crystalline forms wurtzite (hexagonal), sphalerite (cubic), and rock-salt (cubic). The sphalerite CdSe structure is unstable and converts to the wurtzite form upon moderate heating. The transition starts at about 130°C, and at 700°C it completes within a day. The rock-salt structure is only observed under high pressure. However, in our study, the highest temperature was 70°C to approximately 80°C at hydrothermal experiment. So the obtained CdSe compound and CNT-CdSe composite exited cubic CdSe structure. Therefore, the micromorphology of CNT-CdSe is different from that of the mixture of MWNTs and CdSe. No peaks for impurities are detected, indicating that the hydrothermal method used in this study is responsible for the formation of the CNT-CdSe composite.


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

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

XRD patterns of MWCNTs, CdSe, and CNT-CdSe composite.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: XRD patterns of MWCNTs, CdSe, and CNT-CdSe composite.
Mentions: Figure 2 shows X-ray patterns of the pristine MWNTs, CdSe, and CNT-CdSe composite. From Figure 2, it can be seen that the diffractogram of pure MWCNTs exhibit the typical peaks at 25.9° and 42.7°, corresponding to the graphite (002) and (100) reflections (Joint Committee for Powder Diffraction Studies (JCPDS) No. 01-0646) [28], respectively. For CdSe compound, the XRD diffraction peaks around 2θ of 25.4°, 42°, and 50°, which can be indexed to the characteristic peaks (111), (220), and (311) plane reflections of cubic crystal structure CdSe with lattice constants of 6.05 Å according to the standard powder diffraction data (JCPDS No. 65-2891 for CdSe, cubic) [29,30]. However, for CNT-CdSe composite, only the typical peaks arose from CdSe were detected. As we known, CdSe has three crystalline forms wurtzite (hexagonal), sphalerite (cubic), and rock-salt (cubic). The sphalerite CdSe structure is unstable and converts to the wurtzite form upon moderate heating. The transition starts at about 130°C, and at 700°C it completes within a day. The rock-salt structure is only observed under high pressure. However, in our study, the highest temperature was 70°C to approximately 80°C at hydrothermal experiment. So the obtained CdSe compound and CNT-CdSe composite exited cubic CdSe structure. Therefore, the micromorphology of CNT-CdSe is different from that of the mixture of MWNTs and CdSe. No peaks for impurities are detected, indicating that the hydrothermal method used in this study is responsible for the formation of the CNT-CdSe composite.

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.