Journal
APPLIED SURFACE SCIENCE
Volume 364, Issue -, Pages 604-612Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2015.12.200
Keywords
Bismuth oxybromide; Cobalt ferrite; Photocatalysis; Decolorization; Congo red; Magnetic separationa
Categories
Funding
- Natural Science Foundation of Zhejiang Province [LY14B070011, LY15E080002]
- National Natural Science Foundation of China [51208331]
- China Scholarship Council [201308330411]
- Special Funds of Innovative Research Team on Plant Evolutionary Ecology
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Novel magnetically separable BiOBr/CoFe2O4 microspheres assembled from nanoparticles were successfully fabricated by a facile solvothermal method at 160 degrees C for 12 h. Then, BiOBr/CoFe2O4 microspheres were characterized via XRD, TEM, SEM, EDS and VSM. Congo red (CR) was selected as a pollutant model to evaluate the photocatalytic activities of BiOBr/CoFe2O4 microspheres. The value of coercivity (232 Oe) and the saturation magnetization (33.79 emu g(-1)) were obtained, which indicated that BiOBr/CoFe2O4 microspheres can be separated and recovered easily from the treated solution. What is more, by calculation, the initial rate constants of BiOBr/CoFe2O4 microspheres is about 1.45 times higher than that of the pure BiOBr, which resulted from superior adsorption and transfer performance to organic contaminants in aqueous systems. Four consecutive regeneration cycles demonstrated that the BiOBr/CoFe2O4 microspheres had high photostability under simulated solar light irradiation. According to the radical trapping experiments, the h(+) radicals and O-2(center dot-) radicals were the two main active species that drive the photocolorization of CR pollutant by BiOBr/CoFe2O4 microspheres under simulated solar light irradiation. This work suggests that the BiOBr/CoFe2O4 microspheres may be a promising photocatalyst for photodegrading organic pollutants and environmental remediation. (C) 2016 Elsevier B.V. All rights reserved.
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