Journal ArticleDOI
Kinetic modeling of the oxidation of p-hydroxybenzoic acid by Fenton's reagent: implications of the role of quinones in the redox cycling of iron.
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TLDR
A kinetic model capable of describing species concentrations measured experimentally during the Fenton-mediated oxidation of p-hydroxybenzoic acid is presented and the role quinones play in the catalytic redox cycling of iron and the overall effect on the oxidative treatment performance of the system is highlighted.Abstract:
As Fenton (and Fenton-like) chemistry is increasingly implicated in a variety of areas and applications, an understanding of the mechanism and rates governing the system becomes relevant for a growing number of disciplines and purposes. In this work a kinetic model capable of describing species concentrations measured experimentally during the Fenton-mediated oxidation of p-hydroxybenzoic acid (pHBA) is presented and discussed. Experiments were conducted in the dark at low pH using reagent and substrate concentrations ranging from 100 μM to 2 mM. Analysis of the experimental and modeling results reveals that redox reactions between Fe and quinone or quinone-like compounds are essential for the model to qualitatively predict species concentration profiles observed in the laboratory. The quinone and quinone-like compounds generated as byproducts during the oxidation of pHBA act as reducing agents toward Fe(III), thereby assisting the redox cycling of Fe and increasing degradation of the target substrate. Th...read more
Citations
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Journal ArticleDOI
Activation of Peroxymonosulfate by Benzoquinone: A Novel Nonradical Oxidation Process
TL;DR: Findings have important implications for the development of novel nonradical oxidation processes based on PMS, because 1O2 as a moderately reactive electrophile may suffer less interference from background organic matters compared with nonselective •OH and SO4•-.
Journal ArticleDOI
Preparation of magnetite-based catalysts and their application in heterogeneous Fenton oxidation – A review
TL;DR: In this article, a critical review on the application of magnetite-based catalysts to industrial wastewater decontamination by heterogeneous Fenton oxidation is presented, paying attention to their nature and competitive features in terms of activity and durability.
Journal ArticleDOI
Is Sulfate Radical Really Generated from Peroxydisulfate Activated by Iron(II) for Environmental Decontamination
Zhen Wang,Jin Jiang,Su-Yan Pang,Yang Zhou,Chaoting Guan,Yuan Gao,Juan Li,Yi Yang,Wei Qiu,Chengchun Jiang +9 more
TL;DR: It is demonstrated that SO4•- oxidized methyl phenyl sulfoxide (PMSO, a model sulfoxide) to produce biphenyl compounds rather than methylphenyl sulfone (P MSO2), and this work urges re-evaluation of the Fe(II)/PDS system for environmental decontamination, given that Fe(IV) would have different reactivity toward environmental contaminants compared with SO4- and/or •OH.
Journal ArticleDOI
Strong enhancement on fenton oxidation by addition of hydroxylamine to accelerate the ferric and ferrous iron cycles.
TL;DR: A much more efficient Fenton-HA system is proposed which is characterized by combining Fenton system with hydroxylamine (NH₂OH), a common reducing agent, to relieve the aforementioned drawbacks, with benzoic acid (BA) as the probe reagent.
Journal ArticleDOI
Peroxymonosulfate Activation by Fe-Co-O-Codoped Graphite Carbon Nitride for Degradation of Sulfamethoxazole.
TL;DR: The preparation of bimetallic oxides and oxygen co-doped g-C3N4 was successfully prepared, which was an effective PMS activator for degradation of toxic organic pollutants and cycling experiments demonstrated the good stability of Fe-Co-O-g-C 3N4.
References
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Journal ArticleDOI
Catalytic Decomposition of Hydrogen Peroxide by Fe(III) in Homogeneous Aqueous Solution: Mechanism and Kinetic Modeling
Joseph De Laat and,Hervé Gallard +1 more
TL;DR: In this paper, a kinetic model for the decomposition of hydrogen peroxide by ferric ion in homogeneous aqueous solution (pH < 3) was described and the reaction was investigated experimentally at 25.0 °C and I = 0.1 M in a completely mixed batch reactor and under a wide range of experimental conditions.
Journal ArticleDOI
Role of Quinone Intermediates as Electron Shuttles in Fenton and Photoassisted Fenton Oxidations of Aromatic Compounds
TL;DR: In this paper, the influence of organic species on the reactivity of iron, and hence on the rate or course of the reaction was examined for the oxidation of phenol (2 mM) by Fenton systems in the dark and under UV/visible light.
Journal ArticleDOI
Photolysis of Fe (III)-hydroxy complexes as sources of OH radicals in clouds, fog and rain
Bruce C Faust,Jürg Hoigné +1 more
TL;DR: In this paper, the photolysis of the monohydroxy complex of Fe(III), Fe(OH)2+, has been proposed as a major source of OH radicals in rain.
Journal ArticleDOI
Iron Redox Cycling in Surface Waters: Effects of Humic Substances and Light
TL;DR: In this paper, the mechanism of photo-oxidation of natural dissolved organic matter (DOM) in the presence of iron was examined in laboratory model systems containing fulvic acid and lepidocrocite (γ-FeOOH) particles.