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Enhanced Photocatalytic Properties of Ag-Modified Mg-Doped ZnO Nanocrystals Hybridized with Reduced Graphene Oxide Sheets

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Abstract:

Heterojunction semiconductor composites could enhance the photoelectric conversion efficiency of photocatalysts. We successfully in-situ synthesized the hybrids of Mg-doped ZnO and reduced graphene oxide (MZO/RGO) by one-pot wet chemical method. Ag nanocrystals are loaded onto the MZO/RGO composites by photochemical reduction method. Crystallization of MZO/RGO-Ag upon thermal decomposition of the stearate precursors was investigated by X-ray diffraction technique. XRD studies point toward the particles size with 15-20 nm, which was confirmed by scanning electron microscope and energy dispersive X-ray spectroscopy, and also indicates that Ag nanoparticles were deposited on the surface of nanocomposites. The photocatalytic performance of ZnO nanomaterial was significantly improved by Mg-doping, RGO sheets corporation and Ag hybridization. It was found that the RGO sheets take the role of improving the charge separation during the photocatalytic activity, and the presence of Ag nanocrystals enhances the quick discharge of photoinduced electrons under the UV light. Therefore, the MZO/RGO-Ag nanohybrids are excellent candidates for the applications of environmental issues.

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Periodical:

Materials Science Forum (Volume 814)

Pages:

161-166

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.814.161

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Online since:

March 2015

Authors:

Lin Qin Wang, Yan Wu*, Xiang Yang

Keywords:

Ag-Modification, Mg-Doped ZnO, Nanocomposites, Photocatalysis, Reduced Graphene Oxide

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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