Limits...
Surfactant-free synthesis of Cu2O hollow spheres and their wavelength-dependent visible photocatalytic activities using LED lamps as cold light sources.

Wang Y, Huang D, Zhu X, Ma Y, Geng H, Wang Y, Yin G, He D, Yang Z, Hu N - Nanoscale Res Lett (2014)

Bottom Line: The obtained Cu2O hollow spheres were active photocatalyst for the degradation of methyl orange under visible light.The most suitable wavelength for Cu2O to photocatalytic degradation is 550 nm, because the light energy (2.25 eV) is closest to the band gap of Cu2O (2.17 eV).These surfactant-free synthesized Cu2O hollow spheres would be highly attractive for practical applications in water pollutant removal and environmental remediation.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.

ABSTRACT
A facile synthesis route of cuprous oxide (Cu2O) hollow spheres under different temperatures without the aid of a surfactant was introduced. Morphology and structure varied as functions of reaction temperature and duration. A bubble template-mediated formation mechanism was proposed, which explained the reason of morphology changing with reaction temperature. The obtained Cu2O hollow spheres were active photocatalyst for the degradation of methyl orange under visible light. A self-designed equipment of light emitting diode (LED) cold light sources with the wavelength of 450, 550, and 700 nm, respectively, was used for the first time in the photocatalysis experiment with no extra heat introduced. The most suitable wavelength for Cu2O to photocatalytic degradation is 550 nm, because the light energy (2.25 eV) is closest to the band gap of Cu2O (2.17 eV). These surfactant-free synthesized Cu2O hollow spheres would be highly attractive for practical applications in water pollutant removal and environmental remediation.

No MeSH data available.


Related in: MedlinePlus

Schematic diagram of the self-designed photocatalytic equipment setup. The inset shows the figure of different LED lamps as cold light sources with a wavelength of 450, 550, and 700 nm, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4256968&req=5

Figure 6: Schematic diagram of the self-designed photocatalytic equipment setup. The inset shows the figure of different LED lamps as cold light sources with a wavelength of 450, 550, and 700 nm, respectively.

Mentions: A self-designed equipment was applied to carry out the photocatalytic degradation experiment as shown in Figure 6. Four 8-W LED lamps were used as cold light sources which were mounted at 10 cm around the center of the reaction round-bottom flask. This equipment can ensure specific wavelength of the light with no heat introduced as LED lamps are cold light sources. We chose LED lamps with different characteristic wavelengths to serve as the light source of photocatalysis for the first time. LED lamps, as typical cold light sources, are different from Xe lamps with the power of 150 W and often used in the photocatalytic experiment. There is no extra heat introduced into the reaction system using LED cold light and the wavelength can be easily controlled. The LED lamps of wavelength 450, 550, and 700 nm were chosen as the visible light sources, as the limited experiment resources we have.


Surfactant-free synthesis of Cu2O hollow spheres and their wavelength-dependent visible photocatalytic activities using LED lamps as cold light sources.

Wang Y, Huang D, Zhu X, Ma Y, Geng H, Wang Y, Yin G, He D, Yang Z, Hu N - Nanoscale Res Lett (2014)

Schematic diagram of the self-designed photocatalytic equipment setup. The inset shows the figure of different LED lamps as cold light sources with a wavelength of 450, 550, and 700 nm, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4256968&req=5

Figure 6: Schematic diagram of the self-designed photocatalytic equipment setup. The inset shows the figure of different LED lamps as cold light sources with a wavelength of 450, 550, and 700 nm, respectively.
Mentions: A self-designed equipment was applied to carry out the photocatalytic degradation experiment as shown in Figure 6. Four 8-W LED lamps were used as cold light sources which were mounted at 10 cm around the center of the reaction round-bottom flask. This equipment can ensure specific wavelength of the light with no heat introduced as LED lamps are cold light sources. We chose LED lamps with different characteristic wavelengths to serve as the light source of photocatalysis for the first time. LED lamps, as typical cold light sources, are different from Xe lamps with the power of 150 W and often used in the photocatalytic experiment. There is no extra heat introduced into the reaction system using LED cold light and the wavelength can be easily controlled. The LED lamps of wavelength 450, 550, and 700 nm were chosen as the visible light sources, as the limited experiment resources we have.

Bottom Line: The obtained Cu2O hollow spheres were active photocatalyst for the degradation of methyl orange under visible light.The most suitable wavelength for Cu2O to photocatalytic degradation is 550 nm, because the light energy (2.25 eV) is closest to the band gap of Cu2O (2.17 eV).These surfactant-free synthesized Cu2O hollow spheres would be highly attractive for practical applications in water pollutant removal and environmental remediation.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.

ABSTRACT
A facile synthesis route of cuprous oxide (Cu2O) hollow spheres under different temperatures without the aid of a surfactant was introduced. Morphology and structure varied as functions of reaction temperature and duration. A bubble template-mediated formation mechanism was proposed, which explained the reason of morphology changing with reaction temperature. The obtained Cu2O hollow spheres were active photocatalyst for the degradation of methyl orange under visible light. A self-designed equipment of light emitting diode (LED) cold light sources with the wavelength of 450, 550, and 700 nm, respectively, was used for the first time in the photocatalysis experiment with no extra heat introduced. The most suitable wavelength for Cu2O to photocatalytic degradation is 550 nm, because the light energy (2.25 eV) is closest to the band gap of Cu2O (2.17 eV). These surfactant-free synthesized Cu2O hollow spheres would be highly attractive for practical applications in water pollutant removal and environmental remediation.

No MeSH data available.


Related in: MedlinePlus