title: CoFe2O4 magnetic nanoparticles as a highly active heterogeneous catalyst of oxone for the degradation of diclofenac in water.
abstract: 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.
authors.affiliation: State Key Laboratory of Pollution Control Reuse, Tongji University, Shanghai 200092, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Deng
authors.forename: Yisheng
authors.initials: Y
authors.lastname: Shao
authors.forename: Naiyun
authors.initials: N
authors.lastname: Gao
authors.forename: Chaoqun
authors.initials: C
authors.lastname: Tan
authors.forename: Shiqing
authors.initials: S
authors.lastname: Zhou
authors.forename: Xuhao
authors.initials: X
authors.lastname: Hu
mesh_terms: D002114:Calcinosis; D002384:Catalysis; D002853:Chromatography, Liquid; D003035:Cobalt / Q000737:chemistry*; D004008:Diclofenac / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D013058:Mass Spectrometry; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology; D010100:Oxygen / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013431:Sulfates / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D013431:Sulfates; D014874:Water Pollutants, Chemical; D004008:Diclofenac; D003035:Cobalt; D007501:Iron; D010100:Oxygen
keywords: CoFe(2)O(4); Diclofenac; Heterogeneous catalyst; Oxone; Sulfate radicals