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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

XRD patterns. XRD patterns of Cu2O hollow spheres prepared at 0°C, 25°C, and 50°C.
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Figure 3: XRD patterns. XRD patterns of Cu2O hollow spheres prepared at 0°C, 25°C, and 50°C.

Mentions: The composition and phase purity of the products prepared at different reaction temperatures were characterized by XRD as shown in Figure 3. XRD patterns are confirmed with the SAED results, which show the expected (110), (111), (200), (220), (311), and (222) diffraction peaks corresponding to crystal planes of the Cu2O crystals. The insets of Figure 2d,e,f show the SAED patterns of the obtained Cu2O spheres, in which the diffraction rings fit well with crystal planes of Cu2O. No other peak is observed in the XRD patterns, indicating that the products are phase-pure Cu2O crystals. There is no impurity such as cupric oxide or copper.


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)

XRD patterns. XRD patterns of Cu2O hollow spheres prepared at 0°C, 25°C, and 50°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: XRD patterns. XRD patterns of Cu2O hollow spheres prepared at 0°C, 25°C, and 50°C.
Mentions: The composition and phase purity of the products prepared at different reaction temperatures were characterized by XRD as shown in Figure 3. XRD patterns are confirmed with the SAED results, which show the expected (110), (111), (200), (220), (311), and (222) diffraction peaks corresponding to crystal planes of the Cu2O crystals. The insets of Figure 2d,e,f show the SAED patterns of the obtained Cu2O spheres, in which the diffraction rings fit well with crystal planes of Cu2O. No other peak is observed in the XRD patterns, indicating that the products are phase-pure Cu2O crystals. There is no impurity such as cupric oxide or copper.

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