Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 108, Issue -, Pages 159-165Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2013.02.016
Keywords
Fe-Fe2O3 nanostructures; Persulfate; Sulfate radical; Methyl orange
Categories
Funding
- National Science Foundation of China [20977039, 21073069, 21072073, 91023010, 21173093, 21177048]
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In this study, core-shell Fe-Fe2O3 nanostructures (FNs) were used to effectively activate sodium persulfate (Na2S2O8) to induce sulfate radicals (SO4-center dot) oxidation of methyl orange (MO) in aqueous solution (FNs/Na2S2O8). In this FNs/Na2S2O8 system, an enhanced degradation of MO was achieved in comparison with the Fe2+/Na2S2O8 system using ferrous ions as persulfate activator under neutral pH condition. An acid pH and a high persulfate to FNs molar ratio (Na2S2O8:FNs) were favorable to the MO oxidation in the FNs/Na2S2O8 process. We characterized the prepared FNs and the used FNs during the FNs/Na2S2O8 process via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) systematically. On the basis of the degradation and characterization results, we proposed a mechanism for the degradation of MO in the FNs/Na2S2O8 process, which involved in situ homogenous and heterogeneous activation of persulfate simultaneously. (C) 2013 Elsevier B.V. All rights reserved.
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