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Electro-Fenton oxidation of pesticides with a novel Fe3O4@Fe2O3/activated carbon aerogel cathode: High activity, wide pH range and catalytic mechanism

Paper ID Volume ID Publish Year Pages File Format Full-Text
46062 46429 2012 8 PDF Available
Title
Electro-Fenton oxidation of pesticides with a novel Fe3O4@Fe2O3/activated carbon aerogel cathode: High activity, wide pH range and catalytic mechanism
Abstract

A novel electro-Fenton (E-Fenton) system with the Fe3O4@Fe2O3/activated carbon aerogel (ACA) composite cathode was firstly constructed in this study. Its application on degrading imidacloprid exhibited highly catalytic efficiency over a wide applicable pH range from 3 to 9. The removal of imidacloprid and TOC achieved to 90% within 30 and 60 min, respectively. The nature of composite cathode was examined by BJH, XRD, SEM, TEM, XPS and FTIR techniques. ACA with high surface area of 2410 m2 g−1 and multiplicated porosities composed of micropores and mesopores worked not only as cathode but also as Fenton catalyst support, enhancing oxidation activity. We proposed reasonable E-Fenton oxidation mechanisms with Fe3O4@Fe2O3/ACA cathode at acidic and basic conditions. At pH 3, it followed a Haber–Weiss mechanism that the dissolved iron ions and surface Fe(II) sites catalyzed the decomposition of H2O2 to generate hydroxyl radicals (OH). While at pH 9, it was expected the formation and deactivation of H2O2 complex as well as the catalytic decomposition of H2O2 with surface Fe(III) and Fe(II) sites to produce both superoxide anion (O2−/HO2) and hydroxyl radicals (OH), involving an in situ recycling of iron oxide (FeO·Fe2O3 → Fe2O3).

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Novel Fe3O4@Fe2O3/ACA composite cathode was reported for the first time. ► ACA with high surface area 2410 m2 g−1 worked both as cathode and catalyst support. ► 90% of TOC removal was achieved after reaction 60 min over wide pH rage of 3–9. ► Reasonable oxidation mechanisms were proposed when at acidic and basic condition.

Keywords
Composite iron oxide; Activated carbon aerogel electrode; Electro-Fenton; Surface reaction; Imidacloprid
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Electro-Fenton oxidation of pesticides with a novel Fe3O4@Fe2O3/activated carbon aerogel cathode: High activity, wide pH range and catalytic mechanism
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 125, 21 August 2012, Pages 120–127
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us