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

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• 作者：Linli Zhu^a ; Zhihui Ai^a ; ^{jennifer.ai@mail.ccnu.edu.cn} ; Wingkei Ho^b ; Lizhi Zhang^a
• 关键词：Fe&ndash ; Fe2O3 nanostructures ; Persulfate ; Sulfate radical ; Methyl orange
• 刊名：Separation and Purification Technology
• 出版年：2013
• 出版时间：19 April, 2013
• 年：2013
• 卷：108
• 期：Complete
• 页码：159-165
• 全文大小：1079 K

文摘

In this study, core-shell Fe-Fe₂O₃ nanostructures (FNs) were used to effectively activate sodium persulfate (Na₂S₂O₈) to induce sulfate radicals () 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 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.