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iron oxidation reaction hydroxyl radical

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  • Chemistry of iron and copper in radical reactions

    the Fenton reaction - results in hydroxyl radicals via a higher oxidation state of iron [2]. (3) A similar reaction with organic peroxides leads to alkoxyl radicals, although a recent report ...

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  • The consequences of hydroxyl radical formation on the ...

    2001-10-15 · It is possible that hydroxyl radical formation during Fe(II) oxidation by apoferritin in vitro, occurs via the iron-catalyzed Haber-Weiss reactions. The purpose of the present study was to address the effect of hydroxyl radical formation on the stoichiometry and kinetics of Fe(II) oxidation by human apoferritin.

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  • Radiolytic study of the reactions of hydroxyl radical with ...

    2019-10-17 · Radiolytic study of the reactions of hydroxyl radical with cobalt(III), iron(II), and ruthenium(II) complexes containing 2,2''-bipyridyl and cyano ligands A. C. Maliyackel W. L. Waltz

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  • Ethanol Oxidation by Hydroxyl Radicals: Role of Iron ...

    The sequence of reactions leading to the oxy radical‐dependent oxidation of ethanol as was as other hydroxyl radical‐scavenging agents by these various systems is believed to proceed through the formation of a common intermediate, namely, hydrogen peroxide (H 2 O 2), after disrmitation of the superoxide anion radical (O 2 −).

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  • Iron-catalyzed Hydroxyl Radical Formation

    2020-10-30 · Vol. 259, No. 6, Issue of March 25, pp. 3620-3624, 1984 Printed in U.S.A. THE JOURNAL OF BIOLOGICAL CHEMISTRY 0 1984 by The American Society of Biological Chemists, Inc. Iron-catalyzed Hydroxyl Radical Formation STRINGENT REQUIREMENT FOR FREE IRON COORDINATION SITE* (Received for publication, August 8, 1983)

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  • Iron-catalyzed Hydroxyl Radical Formation

    2020-10-30 · Iron-catalyzed Hydroxyl Radical Formation ... reaction. This principle governing iron reactivity may help advance our understanding of the mechanism of ... The rate of oxidation of Fez+ and Fez+-chelates was followed by recording the increase in absorption at 310 nm ...

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  • The Controls of Iron and Oxygen on Hydroxyl Radical (•OH ...

    Oxidation of dissolved ferrous iron (Fe(II)) by oxygen (O 2) produces hydroxyl radical (•OH) in soil waters [1,2,3].]. •OH is an unselective oxidant capable of oxidizing dissolved organic carbon (DOC) to carbon dioxide (CO 2) …

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  • In situ generation of zero valent iron for enhanced ...

    2018-11-15 · Reactive hydroxyl radicals could be generated in the presence of Fe(II) and H 2 O 2 (Eq. ). The reaction rate constant of Eq. is much faster than that of Eq., making the reduction of Fe(III) to Fe(II) a reaction rate-control process for hydroxyl radical generation (Brillas et al., 2009). However, this process could be compensated by Fe(III ...

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  • Fenton-like reaction of the iron(ii)–histidine complex ...

    The hydroxyl radical (˙OH), generated from Fenton/Fenton-like reactions of iron(II) species in biology, can oxidatively damage biomolecules, inducing oxidative stress and diseases.However, this common understanding has been questioned recently after a carbonate radical was observed from the Fenton-like reaction of the iron(II)–carbonate complex.

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  • Hydroxyl Radical-Involving p-Nitrophenol Oxidation …

    2021-2-5 · Sulfidated zerovalent iron (S-ZVI) has been extensively used for reducing pollutants. In this study, the oxidation process in the reductive removal of p-nitrophenol (PNP) by S-ZVI was confirmed under anaerobic conditions. We revealed that a PNP oxidation process involving •OH resulted from the H2O2 activation by surface-bound Fe(II) in S-ZVI, in which H2O2 was …

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  • FENTON PROCESS: A CASE STUDY FOR TREATMENT OF …

    2018-6-22 · highly reactive hydroxyl radicals ( OH). The reactivity of this system was first observed in 1894 by its inventor H.J.H. Fenton. Fenton''s reagent is the result of reaction between hydrogen peroxide (H 2 O 2) and ferrous iron (Fe2+), producing the hydroxyl radical ( OH). The hydroxyl radical is a strong oxidant capable of oxidizing

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  • Complex-formation and reduction of ferric iron by 2-oxo-4 ...

    1986-4-15 · The effect of EDTA and iron on the oxidation of hydroxyl radical scavenging agents and ethanol by rat liver microsomes. Biochem Biophys Res Commun. 1983 Oct 31; 116 (2):765–770. [Google Scholar] Feierman DE, Winston GW, Cederbaum AI. Ethanol oxidation by hydroxyl radicals: role of iron chelates, superoxide, and hydrogen peroxide.

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  • THE ROLE OF IRON IN FREE RADICAL OXIDATIONS: EPR …

    2007-8-8 · forming iron-oxygen complexes, ferryl or perferryl ions. All of these species are highly oxidizing and are able to initiate free radical oxidations. Iron also has another potential role in lipid peroxidation. In the propagation step, iron can react with LOOH in a reaction parallel to the Fenton reaction to form alkoxyl radicals (LO ...

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  • Pathway for the Production of Hydroxyl Radicals during …

    2019-12-30 · The reduction of ferric iron (Fe(III)) to ferrous iron (Fe(II)) by dissimilatory iron-reducing bacteria is widespread in anaerobic environments. The oxidation of Fe(II) in aerobic environments has been found to produce hydroxyl radicals (•OH); however, the role of iron-reducing bacteria in the process has not been well understood. Here, Shewanella oneidensis …

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  • Rate Constants for Reaction of Hydroxyl Radicals with ...

    2007-12-12 · Rate Constants for Reaction of Hydroxyl Radicals with Several Drinking Water Contaminants Werner R. Haag*''t and C. C. Davld Yao Chemistry Laboratory, SRI International, 333 Ravenswood Avenue, Menlo Park, California 94025 Rate constants for reactions of the hydroxyl radical with 25 potential organic drinking water contaminants, in-

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  • Hydroxyl Radical-Dominated Catalytic Oxidation in Neutral ...

    2019-5-26 · The ligands and protein surroundings are important in peroxidase processes with iron porphyrins as catalysts. Similarly, two bioinspired composite catalysts made from iron phthalocyanine with axial ligands, 4-aminopyridine and 2-aminoethanethiol, were anchored on multiwalled carbon nanotubes to degrade some pollutants to the water environment, such as 4 …

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  • Hydroxyl radical formation upon dark oxidation of reduced ...

    2019-12-1 · In this work, the hydroxyl radical formation upon dark oxidation of various reduced iron minerals, including siderite (FeCO 3), magnetite (Fe 3 O 4), pyrite (FeS 2), reduced nontronite (iron-bearing smectite clay), and mackinawite (FeS), was compared at …

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  • Hydroxyl radical formation upon dark oxidation of reduced ir…

    Part 1: Oxidation and OH radicals - Harvard University

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  • Quantitation of hydroxyl radical during Fenton oxidation ...

    2000-8-1 · The efficiency of hydroxyl radical production from peroxide is affected by a number of factors, including pH, iron oxidation state, and iron chelation. Phosphate has been reported to inhibit hydroxyl radical production (Vella and Munder, 1993), and additional reports indicate either inhibition (Croft et al., 1992) or acceleration (Puppo, 1992 ...

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  • Part 1: Oxidation and OH radicals

    2011-12-26 · 1. Hydroxyl radicals (OH) clean the air. Image: Elmar Uherek. Oxidation in a chemical sense does not necessarily mean a reaction with oxygen containing compounds, it is rather the loss of electrons. However, in the air, oxidation does generally involve the reaction of a chemical species with an oxygen containing compound.

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  • FENTON REACTION

    2009-9-21 · Keywords: Fenton reaction, Fenton reagent, Fenton chemistry, hydroxyl radical, ferryl ion Introduction The oxidation of organic substrates by iron(II) and hydrogen peroxide is called the "Fenton chemistry ", as it was first described by H.J.H. Fenton who first observed the

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  • Advanced Oxidation Processes (AOPs) in Wastewater ...

    2015-9-18 · Hydroxyl radical is the most reactive oxidizing agent in water treatment, with an oxidation potential between 2.8 V (pH 0) and 1.95 V (pH 14) vs. SCE (saturated calomel electrode, the most commonly used reference electrode) …

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  • pH-induced mechanistic changeover from hydroxyl …

    A major pathway in the reaction between Fe(II) and H 2 O 2 at pH 6–7 in non-coordinating buffers exhibits inverse kinetic dependence on [H +] and leads to oxidation of dimethyl sulfoxide (DMSO) to dimethyl sulfone (DMSO 2).This step …

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  • Iron redox cycling in hydroxyl radical generation during ...

    2011-8-11 · The photo-Fenton oxidative degradation process consisting of the hydroxyl radical generation in aqueous iron–hydrogen peroxide systems has been widely investigated as a promising process to remove harmful organic pollutants in wastewater,,,,,, the photo-Fenton oxidation water and wastewater treatment, the highly reactive hydroxyl radical (OH) …

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  • Generation of hydroxyl radicals from reactions between a ...

    2018-7-17 · The hydroxyl radical (·OH) is a powerful oxidant that is produced in a wide range of environments via the Fenton reaction (Fe2+ + H2O2 → Fe3+ + ·OH + OH-). The reactants are formed from the ...

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  • Ethanol oxidation by hydroxyl radicals: role of iron ...

    The sequence of reactions leading to the oxy radical-dependent oxidation of ethanol as well as other hydroxyl radical-scavenging agents by these various systems is believed to proceed through the formation of a common intermediate, namely, hydrogen peroxide (H2O2), after dismutation of the superoxide anion radical (O2-.).

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  • Ascorbate oxidation by iron, copper and reactive oxygen ...

    2021-4-1 · Measurements of ascorbic acid oxidation by iron and copper were conducted in an online instrument described in detail in Campbell et al. …

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  • Oxidation Inhibits Iron-Induced Blood Coagulation

    2021-10-7 · Hydroxyl free radicals are, in turn, produced by poorly chelated iron ions accumulating in the circulation from the ingested food and/or hemoglobin leaking from red blood cells (RBC). Hydroxyl radicals cause unfolding of FBG polypeptide chain(s) with the exposure of buried hydrophobic epitopes that form intermolecular bonds resistant to ...

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  • The Controls of Iron and Oxygen on Hydroxyl Radical (•OH ...

    Oxidation of dissolved ferrous iron (Fe(II)) by oxygen (O 2) produces hydroxyl radical (•OH) in soil waters [1,2,3].]. •OH is an unselective oxidant capable of …

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  • The role of iron chelates in hydroxyl radical production ...

    Thus, the iron chelates which promoted NADPH oxidation by the reductase were the only chelates which stimulated oxidation of hydroxyl radical scavengers by reductase and microsomes. The oxidation of aminopyrine, a typical drug substrate, was slightly stimulated by the addition of iron-EDTA or iron-DTPA to the microsomes.

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  • Hydroxyl Radical-Involving p-Nitrophenol Oxidation …

    Sulfidated zerovalent iron (S-ZVI) has been extensively used for reducing pollutants. In this study, the oxidation process in the reductive removal of p-nitrophenol (PNP) by S-ZVI was confirmed under anaerobic conditions.We revealed that a PNP oxidation process involving • OH resulted from the H 2 O 2 activation by surface-bound Fe(II) in S-ZVI, in which H 2 O 2 was generated …

    Read More

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