Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

被引:109
作者
Ben Hammouda, Samia [1 ,2 ]
Fourcade, Florence [2 ]
Assadi, Aymen [2 ]
Soutrel, Isabelle [2 ]
Adhoum, Nafaa [1 ]
Amrane, Abdeltif [2 ]
Monser, Lotfi [1 ]
机构
[1] Inst Natl Sci Appl & Technol, Tunis 1080, Tunisia
[2] CNRS, UMR 6226, Ecole Natl Super Chim Rennes, F-35708 Rennes 7, France
来源
APPLIED CATALYSIS B-ENVIRONMENTAL | 2016年 / 182卷
关键词
Electro-Fenton; Photoelectro-Fenton; Iron alginate catalyst; Indole; Degradation pathway; BORON-DOPED DIAMOND; UVA PHOTOELECTRO-FENTON; ADVANCED OXIDATION PROCESSES; ANODIC-OXIDATION; PHOTO-FENTON; AQUEOUS-MEDIUM; AZO-DYE; ELECTROCHEMICAL DEGRADATION; ACETAMINOPHEN DEGRADATION; PERSOLVENT FERMENTATION;
D O I
10.1016/j.apcatb.2015.09.007
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070305 [高分子化学与物理];
摘要
In this work the characterization and the performance of iron immobilized in alginate beads (Fe-ABs) as catalyst for heterogeneous electro-Fenton (EF) treatment of a malodorous compound, indole, was investigated. Experimental results demonstrated that indole was effectively removed through the electro-Fenton process; while in the considered experimental conditions, the performances of EF were only slightly improved by the addition of UVA radiation. The most efficient operating conditions were achieved at pH 3.0 in the presence of 200 mg L-1 Fe-ABs catalyst (corresponding to an average iron concentration of 64 mg L-1) with a current density of 0.53 mA cm(-2). Under these conditions, 60 min were sufficient to completely degrade 20 mg L-1 of indole, whose removal was found to obey the pseudo-first order model. In terms of organic carbon removal, about 90% mineralization yield was reached in the optimal conditions for 7 h heterogeneous electro-Fenton treatment time. UPLC-MS/MS analysis was applied to identify and follow the evolution of indole oxidation products. Five stable organics intermediates were observed and four of them were identified as dioxindole, isatin, oxindole and anthranilic acid. A reaction sequence was therefore proposed for indole degradation according to the detected products. Subsequent attack of these intermediates by (OH)-O-center dot radicals led to the formation of short chain acids such as succinic, acetic, oxamic and oxalic identified by ion-exclusion chromatography. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:47 / 58
页数:12
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