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

被引：228

作者：

Avetta, Paola ^{[1
]}

Pensato, Alessia ^{[1
]}

Minella, Marco ^{[1
]}

Malandrino, Mery ^{[1
]}

Maurino, Valter ^{[1
]}

Minero, Claudio ^{[1
]}

Hanna, Khalil ^{[2
]}

Vione, Davide ^{[1
]}

机构：

[1] Univ Turin, Dipartimento Chim, I-10125 Turin, Italy

[2] Ecole Natl Super Chim Rennes, CNRS, UMR 6226, F-35708 Rennes 7, France

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2015年 / 49卷 / 02期

关键词：

ADVANCED OXIDATION; RATE CONSTANTS; AQUEOUS-SOLUTION; MECHANISM; REMEDIATION; WATER; IRON; STOICHIOMETRY; RADICALS; PH;

D O I：

10.1021/es503741d

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 + S2O82 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.

引用

页码：1043 / 1050

页数：8

共 56 条

[1] Oxidative and Reductive Pathways in Iron-Ethylenediaminetetraacetic Acid-Activated Persulfate Systems [J].