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Author Lv, Ming ♦ Liu, Haiqiang
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ALUMINIUM COMPOUNDS ♦ AUGER ELECTRON SPECTROSCOPY ♦ BINDING ENERGY ♦ CARBON DIOXIDE ♦ COMPARATIVE EVALUATIONS ♦ COPPER COMPOUNDS ♦ COPRECIPITATION ♦ CRYSTAL STRUCTURE ♦ DENSITY FUNCTIONAL METHOD ♦ EMISSION SPECTROSCOPY ♦ ENERGY GAP ♦ MAGNESIUM HYDROXIDES ♦ NICKEL HYDROXIDES ♦ PHOTOCATALYSIS ♦ POWDERS ♦ SPECTRAL REFLECTANCE ♦ X-RAY DIFFRACTION
Abstract Three types of CuMAl layered double hydroxides (LDHs, M=Mg, Zn, Ni) were successfully synthesized by coprecipitation. Powder X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES) and UV–Vis diffuse reflectance spectrum (UV–vis) were used to confirm the formation of as-synthesized solids with good crystal structure. The photocatalytic activity of those LDH materials for CO{sub 2} reduction under visible light was investigated. The experimental results show that CuNiAl-LDHs with narrowest band gap and largest surface areas behave highest efficiency for methanol generation under visible light compared with CuMgAl-LDHs and CuZnAl-LDHs. The CuNiAL-LDH showed high yield for methanol production i.e. 0.210 mmol/g h, which was high efficient. In addition, the influence of the different M{sup 2+} on the structures and stability of the CuMAl-LDHs was also investigated by analyzing the geometric parameters, electronic arrangement, charge populations, hydrogen-bonding, and binding energies by density functional theory (DFT) analysis. The theoretical calculation results show that the chemical stability of LDH materials followed the order of CuMgAl-LDHs>CuZnAl-LDHs>CuNiAl-LDHs, which is just opposite with the photocatalytic activity and band gaps of three materials. - Graphical abstract: The host–guest calculation models and XRD patterns of CuMAl-LDHs: CuMgAl-LDHs (a), CuZnAl-LDHs (b) and CuNiAl-LDHs (c). - Highlights: • Three types of CuMAl layered double hydroxides (LDHs, M=Mg, Zn, Ni) has been synthesized. • CuMgNi shows narrower band gap and more excellent textural properties than other LDHs. • The band gap: CuMgAl<CuZnAl<CuNiAl based on result from UV–vis analysis. • CuMgAl shows the highest stability and lowest photocatalytic activity, while CuNiAl just opposite.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-07-15
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 227


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