Core–shell Fe–Fe₂O₃ nanostructures as effective persulfate activator for degradation of methyl orange

Linli ZHU, Zhihui AI, Wing Kei HO, Lizhi ZHANG

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69 Citations (Scopus)

Abstract

In this study, core–shell Fe–Fe2O3 nanostructures (FNs) were used to effectively activate sodium persulfate (Na2S2O8) to induce sulfate radicals (SO4-) 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+/Na2S2O8Fe2+/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. Copyright © 2013 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)159-165
JournalSeparation and Purification Technology
Volume108
Early online date22 Feb 2013
DOIs
Publication statusPublished - Feb 2013

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Nanostructures
Degradation
methyl orange
Oxidation
X ray photoelectron spectroscopy
Chemical activation
Sodium
Ions
Transmission electron microscopy
X ray diffraction
Scanning electron microscopy
Acids

Bibliographical note

Zhu, L., Ai, Z., Ho, W., & Zhang, L. (2013). Core–shell Fe–Fe₂O₃ nanostructures as effective persulfate activator for degradation of methyl orange. Separation and Purification Technology, 108, 159-165. doi: 10.1016/j.seppur.2013.02.016

Keywords

  • Persulfate
  • Sulfate radical
  • Methyl orange
  • Fe–Fe₂O₃ nanostructures