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Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles

The hydroxyl radical (·OH) is a powerful oxidant that is produced in a wide range of environments via the Fenton reaction (Fe(2+)  + H(2)O(2) → Fe(3+)  + ·OH + OH(-)). The reactants are formed from the reduction of Fe(3+) and O(2), which may be promoted by organic reductants, such as hydroquinones....

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Autores principales: Lyngsie, Gry, Krumina, Lelde, Tunlid, Anders, Persson, Per
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6050337/
https://www.ncbi.nlm.nih.gov/pubmed/30018415
http://dx.doi.org/10.1038/s41598-018-29075-5
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author Lyngsie, Gry
Krumina, Lelde
Tunlid, Anders
Persson, Per
author_facet Lyngsie, Gry
Krumina, Lelde
Tunlid, Anders
Persson, Per
author_sort Lyngsie, Gry
collection PubMed
description The hydroxyl radical (·OH) is a powerful oxidant that is produced in a wide range of environments via the Fenton reaction (Fe(2+)  + H(2)O(2) → Fe(3+)  + ·OH + OH(-)). The reactants are formed from the reduction of Fe(3+) and O(2), which may be promoted by organic reductants, such as hydroquinones. The aim of this study was to investigate the extent of ·OH formation in reactions between 2,6-dimethoxyhydroquinone (2,6-DMHQ) and iron oxide nanoparticles. We further compared the reactivities of ferrihydrite and goethite and investigated the effects of the O(2) concentration and pH on the generation of ·OH. The main finding was that the reactions between 2,6-DMHQ and iron oxide nanoparticles generated substantial amounts of ·OH under certain conditions via parallel reductive dissolution and catalytic oxidation reactions. The presence of O(2) was essential for the catalytic oxidation of 2,6-DMHQ and the generation of H(2)O(2). Moreover, the higher reduction potential of ferrihydrite relative to that of goethite made the former species more susceptible to reductive dissolution, which favored the production of ·OH. The results highlighted the effects of surface charge and ligand competition on the 2,6-DMHQ oxidation processes and showed that the co-adsorption of anions can promote the generation of ·OH.
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spelling pubmed-60503372018-07-19 Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles Lyngsie, Gry Krumina, Lelde Tunlid, Anders Persson, Per Sci Rep Article The hydroxyl radical (·OH) is a powerful oxidant that is produced in a wide range of environments via the Fenton reaction (Fe(2+)  + H(2)O(2) → Fe(3+)  + ·OH + OH(-)). The reactants are formed from the reduction of Fe(3+) and O(2), which may be promoted by organic reductants, such as hydroquinones. The aim of this study was to investigate the extent of ·OH formation in reactions between 2,6-dimethoxyhydroquinone (2,6-DMHQ) and iron oxide nanoparticles. We further compared the reactivities of ferrihydrite and goethite and investigated the effects of the O(2) concentration and pH on the generation of ·OH. The main finding was that the reactions between 2,6-DMHQ and iron oxide nanoparticles generated substantial amounts of ·OH under certain conditions via parallel reductive dissolution and catalytic oxidation reactions. The presence of O(2) was essential for the catalytic oxidation of 2,6-DMHQ and the generation of H(2)O(2). Moreover, the higher reduction potential of ferrihydrite relative to that of goethite made the former species more susceptible to reductive dissolution, which favored the production of ·OH. The results highlighted the effects of surface charge and ligand competition on the 2,6-DMHQ oxidation processes and showed that the co-adsorption of anions can promote the generation of ·OH. Nature Publishing Group UK 2018-07-17 /pmc/articles/PMC6050337/ /pubmed/30018415 http://dx.doi.org/10.1038/s41598-018-29075-5 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Lyngsie, Gry
Krumina, Lelde
Tunlid, Anders
Persson, Per
Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles
title Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles
title_full Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles
title_fullStr Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles
title_full_unstemmed Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles
title_short Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles
title_sort generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6050337/
https://www.ncbi.nlm.nih.gov/pubmed/30018415
http://dx.doi.org/10.1038/s41598-018-29075-5
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