Activation of Persulfate by Irradiated Magnetite: Implications for the Degradation of Phenol under Heterogeneous Photo-Fenton-Like Conditions

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• 作者：Paola Avetta ; Alessia Pensato ; Marco Minella ; Mery Malandrino ; Valter Maurino ; Claudio Minero ; Khalil Hanna ; Davide Vione
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：January 20, 2015
• 年：2015
• 卷：49
• 期：2
• 页码：1043-1050
• 全文大小：363K
• ISSN：1520-5851

文摘

We show that phenol can be effectively degraded by magnetite in the presence of persulfate (S₂O₈^{2鈥?/sup>) under UVA irradiation. The process involves the radical SO₄鈥撯€?/sup>, formed from S₂O₈2鈥?/sup> in the presence of FeII. Although magnetite naturally contains FeII, the air-exposed oxide surface is fully oxidized to FeIII and irradiation is required to produce FeII. The magnetite + S₂O₈2鈥?/sup> system was superior to the corresponding magnetite + H₂O₂ one in the presence of radical scavengers and in a natural water matrix, but it induced phenol mineralization in ultrapure water to a lesser extent. The leaching of Fe from the oxide surface was very limited, and much below the wastewater discharge limits. The reasonable performance of the magnetite/persulfate system in a natural water matrix and the low levels of dissolved Fe are potentially important for the removal of organic contaminants in wastewater.}