Visible-light-induced photocatalytic performances of ZnO-CuO nanocomposites for degradation of 2,4-dichlorophenol

Nanostructured ZnO and CuO, and coupled oxides, i.e., ZnCu, Zn2Cu, and ZnCu2, with ZnO：CuO molar ratios of 1：1, 2：1, and 1：2, respectively, were successfully prepared through a simple, one-step, microwave-assisted urea-nitrate combustion synthesis, without the use of organic solvents or surfactants....

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Bibliographic Details
Published in:Chinese journal of catalysis 2015-08, Vol.36 (8), p.1263-1272
Main Authors: Sherly, E.D., Vijaya, J. Judith, Kennedy, L. John
Format: Article
Language:chi ; eng
Subjects:
Coupled metal oxide
Nano structures
Photocatalytic degradation
Recombination
Visible light irradiation
X-射线光电子能谱
傅里叶变换红外光谱
光催化性能
光催化降解效率
光诱导
对氯酚
纳米ZnO
纳米复合材料
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Summary:Nanostructured ZnO and CuO, and coupled oxides, i.e., ZnCu, Zn2Cu, and ZnCu2, with ZnO：CuO molar ratios of 1：1, 2：1, and 1：2, respectively, were successfully prepared through a simple, one-step, microwave-assisted urea-nitrate combustion synthesis, without the use of organic solvents or surfactants. The prepared samples were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive X-ray analysis, transmission electron microscopy, Fourier-transform infrared spectroscopy, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The optical absorption of Zn O extended into the visible region after CuO loading. The photocatalytic activities of ZnO, CuO, and the coupled oxides were evaluated based on photodegradation of 2,4-dichlorophenol under visible-light irradiation. The coupled metal oxide Zn2Cu showed the best photocatalytic activity; this was mainly attributed to the extended photoresponsive range and the increased charge separation rate in the nanocomposite. The photocatalytic degradation process obeyed pseudo-first-order kinetics. The results suggest that the coupled metal oxide Zn2Cu has potential applications as an efficient catalytic material with high efficiency and recyclability for the photocatalytic degradation of organic pollutants in aqueous solution under visible-light irradiation.
ISSN:0253-9837
1872-2067
1872-2067
DOI:10.1016/S1872-2067(15)60886-5