Fabrication and Photocatalytic Property of ZnO/Ag Microspheres

doi:10.7503/cjcu20130598

Abstract

Abstract:

ZnO/Ag microspheres were synthesized on the basis of as-prepared ZnO microspheres by microwave-assisted polyol method. The microstructures, morphologies and optical properties of the samples were characterized by X-ray diffractometer(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM), UV-Visible absorption spectrometer(UV-Vis) and photoluminescence spectrometer(PL). The photocatalytic activities of the samples were tested with the photocatalytic degradation of methylene blue. Results demonstrate that the surfaces of wurtzite ZnO spheres are coated by very small face-center-cubic Ag nanoparticles; ZnO/Ag composites have strong absorption in the UV and visible light range and the absorption band shows some red-shifts compared to the ZnO microspheres. With the increase of Ag content, the photoluminescence intensity of ZnO/Ag composites decreases firstly and then increases; ZnO/Ag composites exhibit higher photocatalytic activity than ZnO particles; however, the ZnO/Ag composite prepared with AgNO₃ concentration of 0.05 mol/L has the highest photocatalytic activity.

Key words: ZnO microsphere, ZnO/Ag microsphere, Photocatalysis, Methylene blue

CLC Number:

O641

TrendMD:

ZHANG Zhen-Fei, LIU Hai-Rui, ZHANG Hua, LIU Xu-Guang, JIA Hu-Sheng, XU Bing-She. Fabrication and Photocatalytic Property of ZnO/Ag Microspheres[J]. Chem. J. Chinese Universities, 2013, 34(12): 2827.

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