Core-shell SiO2/Ag composite spheres: synthesis, characterization and photocatalytic properties
Published Online: Jan 02, 2017
Page range: 806 - 810
Received: Mar 01, 2016
Accepted: Oct 20, 2016
DOI: https://doi.org/10.1515/msp-2016-0121
Keywords
© 2016 Wroclaw University of Technology
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Core-shell SiO2/Ag composite spheres with dense, complete and nanoscaled silver shell were prepared by using a novel facile chemical reduction method without surface modification of silica at room temperature. The core-shell composites were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy and energy dispersive X-ray spectroscopy (EDX). The photocatalytic properties towards the degradation of methyl orange (Mo) of the prepared SiO2/Ag composites were also tested. The studies showed that the surface of SiO2 microspheres was homogeneously and completely covered by Ag nanoparticles and the composite exhibited excellent photocatalytic activities. The possible reaction mechanisms for the formation of the silica-silver core-shell spheres were also discussed in this paper.