We show that phenol can be effectively degraded by magnetite in the presence of persulfate (S2O82−) under UVA irradiation. The process involves the radical SO4−•, formed from S2O82− 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 + S2O8 2− system was superiorto 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. color spaces.

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

AVETTA, PAOLA;MINELLA, Marco;MALANDRINO, Mery;MAURINO, Valter;MINERO, Claudio;VIONE, Davide Vittorio
2015-01-01

Abstract

We show that phenol can be effectively degraded by magnetite in the presence of persulfate (S2O82−) under UVA irradiation. The process involves the radical SO4−•, formed from S2O82− 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 + S2O8 2− system was superiorto 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. color spaces.
49
1043
1050
http://pubs.acs.org/doi/abs/10.1021/es503741d
Biodegradation; Contamination; Irradiation; Phenols; Degradation of phenols; Heterogeneous photo-Fenton; Natural-water matrices; Organic contaminant; Radical scavengers; Ultra-pure water; Uva irradiations; Wastewater discharge
P. Avetta; A. Pensato; M. Minella; M. Malandrino; V. Maurino; C. Minero; K. Hanna; D. Vione
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/153535
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