Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 111, Issue -, Pages 280-287Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2011.10.009
Keywords
Cobalt ferrite; Graphene; Photocatalyst; Magnetic separation; Visible-light irradiation
Funding
- National Natural Science Foundation of China [21171094]
- Science and Technology Department of Jiangsu Province [BE2009159, BE2009175]
- NUST [2011PYXM03]
- Department of Education of Jiangsu Province [CXZZ11_0245]
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A straightforward strategy was designed for the fabrication of magnetically separable CoFe2O4-graphene photocatalysts with differing graphene content. It is very interesting that the combination of CoFe2O4 nanoparticles with graphene results in a dramatic conversion of the inert CoFe2O4 into a highly active catalyst for the degradation of methylene blue (MB), Rhodamine B (RhB), methyl orange (MO), active black BL-G and active red RGB under visible-light irradiation. The significant enhancement in photoactivity under visible-light irradiation can be ascribed to reduction of graphene oxide, because the photogenerated electrons of CoFe2O4 can transfer easily from the conduction band to the reduced graphene oxide, effectively preventing a direct recombination of electrons and holes. Hydroxyl radicals play the role of main oxidant in the CoFe2O4-graphene system and the radicals' oxidation reaction is obviously dominant. CoFe2O4 nanoparticles themselves have a strong magnetic property, which can be used for magnetic separation in a suspension system, and therefore the introduction of additional magnetic supports is no longer necessary. (C) 2011 Elsevier B.V. All rights reserved.
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