Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 132, Issue 2-3, Pages 673-681Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2011.11.085
Keywords
Graphene; ZnO; Photodegradation; Methylene blue; Photocatalysis
Categories
Funding
- National Natural Science Foundation of China [21073115, 20604014]
- Natural Science Foundation of Shanxi province [2007021008]
- Program for New Century Excellent Talents in University of China [NCET-10-0926]
- Program for the Top Young and Middle-aged Innovative Talents of Higher Learning Institutions of Shanxi province
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The nano-sized zinc oxide-graphene oxide (ZnO-GO) hybrid has been prepared by using GO dispersed in the ethanol as carrier, zinc acetate dihydrate and lithium hydroxide monohydrate as reactant. Then the nano-sized hybrid material of ZnO-graphene (ZnO-G) is obtained by thermally treating ZnO-GO at different temperatures. The samples are characterized by using scanning and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman, electron absorption and photoluminescence emission spectroscopy. The results reveal that both sides of the graphene sheets are coated with ZnO particles, and that the lattice constants and the band gap energy of ZnO have been changed compared with the pure nano-sized ZnO particles. The photodegradation of methylene blue (MB) has been investigated in the presence of hybrid materials. It is found that ZnO-G prepared at 200 degrees C containing 2.5% graphene exhibits the highest activity which is three times as large as that of pure ZnO. The optimum ZnO-G catalyst still retains the 80% of the initial activity still after it has been used 5 times repeatedly, and exhibits larger rate for MB degradation than pure ZnO in each recycled time. (c) 2011 Elsevier B.V. All rights reserved.
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