Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 262, Issue -, Pages 836-844Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.09.049
Keywords
CoFe2O4; Oxone; Diclofenac; Sulfate radicals; Heterogeneous catalyst
Categories
Funding
- National Major Project of Science & Technology Ministry of China [2012ZX07403-001]
- Ministry of Housing and Urban-Rural Development [2009-K7-4]
- National Natural Science Fund projects [51178321]
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A magnetic nanoscaled catalyst cobalt ferrite (CoFe2O4) was successfully prepared and used for the activation of oxone to generate sulfate radicals for the degradation of diclofenac. The catalyst was characterized by transmission electron microscopy, X-ray diffractometry, Fourier transform infrared spectroscopy and vibrating sample magnetometer. The effects of calcination temperature, initial pH, catalyst and oxone dosage on the degradation efficiency were investigated. Results demonstrated that CoFe2O4-300 exhibited the best catalytic performance and almost complete removal of diclofenac was obtained in 15 min. The degradation efficiency increased with initial pH decreasing in the pH range of 5-9. The increase of catalyst and oxone dosage both had the positive effect on the degradation of diclofenac. Moreover, CoFe2O4 could retain high degradation efficiency even after being reused for five cycles. Finally, the major diclofenac degradation intermediates were identified and the primary degradation pathways were proposed. (C) 2013 Elsevier B.V. All rights reserved.
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