fulltext.study @t Gmail

Kinetics of oxidative degradation/mineralization pathways of the phenylurea herbicides diuron, monuron and fenuron in water during application of the electro-Fenton process

Paper ID Volume ID Publish Year Pages File Format Full-Text
47281 46466 2010 8 PDF Available
Title
Kinetics of oxidative degradation/mineralization pathways of the phenylurea herbicides diuron, monuron and fenuron in water during application of the electro-Fenton process
Abstract

The electrochemical advanced oxidation method “electro-Fenton process” has been applied to three phenylurea herbicides, namely diuron, monuron and fenuron. The reactivity of these phenylurea herbicides toward hydroxyl radicals has been found to depend on the number of chlorine substituents of the aromatic cycle. The degradation reaction rate constants ranged from 4.8 × 109 to 12 × 109 M−1 s−1, and increased in the following order: diuron (2 Cl) < monuron (1 Cl) < fenuron (no Cl). In this work, we have also investigated the mineralization of aqueous solutions of these herbicides in term of chemical oxygen demand (COD) abatement and mineralization degree larger than 90% for a 3 h treatment time was found. Several aromatic by-products, mainly formed by oxidation of the N-terminal group, accompanied by hydroxylation of the aromatic cycle and/or side methyl group, and aromatic dehalogenation, have been identified. Further steps involved the oxidative opening of the aromatic ring, leading to carboxylic acids and inorganic ions.

Keywords
Electro-Fenton process; Phenylurea herbicides; Hydroxyl radicals; Mineralization pathways; Wastewater treatment
First Page Preview
Kinetics of oxidative degradation/mineralization pathways of the phenylurea herbicides diuron, monuron and fenuron in water during application of the electro-Fenton process
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 97, Issues 1–2, 9 June 2010, Pages 82–89
Authors
, , , , ,
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