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

Lyngsie, Gry LU ; Krumina, Lelde LU ; Tunlid, Anders LU and Persson, Per LU (2018) In Scientific Reports 8(1).
Abstract

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 reduction of Fe3+ and O2, 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 O2 concentration and pH on the generation of ·OH. The main finding was that the reactions between 2,6-DMHQ and iron... (More)

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 reduction of Fe3+ and O2, 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 O2 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 O2 was essential for the catalytic oxidation of 2,6-DMHQ and the generation of H2O2. 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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author
organization
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Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
8
issue
1
publisher
Nature Publishing Group
external identifiers
  • scopus:85050213139
ISSN
2045-2322
DOI
10.1038/s41598-018-29075-5
language
English
LU publication?
yes
id
30f3f545-8b2a-4797-868a-cae1b96a2aa0
date added to LUP
2018-08-14 11:05:06
date last changed
2019-03-19 03:58:05
@article{30f3f545-8b2a-4797-868a-cae1b96a2aa0,
  abstract     = {<p>The hydroxyl radical (·OH) is a powerful oxidant that is produced in a wide range of environments via the Fenton reaction (Fe<sup>2+</sup> + H<sub>2</sub>O<sub>2</sub> → Fe<sup>3+</sup> + ·OH + OH<sup>-</sup>). The reactants are formed from the reduction of Fe<sup>3+</sup> and O<sub>2</sub>, 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<sub>2</sub> 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<sub>2</sub> was essential for the catalytic oxidation of 2,6-DMHQ and the generation of H<sub>2</sub>O<sub>2</sub>. 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.</p>},
  articleno    = {10834},
  author       = {Lyngsie, Gry and Krumina, Lelde and Tunlid, Anders and Persson, Per},
  issn         = {2045-2322},
  language     = {eng},
  month        = {07},
  number       = {1},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles},
  url          = {http://dx.doi.org/10.1038/s41598-018-29075-5},
  volume       = {8},
  year         = {2018},
}