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Influence of organic ligands on the stoichiometry of magnetite nanoparticles
Magnetite, a ubiquitous mineral in natural systems, is of high interest for a variety of applications including environmental remediation, medicine, and catalysis. If the transformation of magnetite to maghemite through the oxidation of Fe(2+) has been well documented, mechanisms involving dissoluti...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
RSC
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10408591/ https://www.ncbi.nlm.nih.gov/pubmed/37560422 http://dx.doi.org/10.1039/d3na00240c |
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author | Jungcharoen, Phoomipat Marsac, Rémi Choueikani, Fadi Masson, Delphine Pédrot, Mathieu |
author_facet | Jungcharoen, Phoomipat Marsac, Rémi Choueikani, Fadi Masson, Delphine Pédrot, Mathieu |
author_sort | Jungcharoen, Phoomipat |
collection | PubMed |
description | Magnetite, a ubiquitous mineral in natural systems, is of high interest for a variety of applications including environmental remediation, medicine, and catalysis. If the transformation of magnetite to maghemite through the oxidation of Fe(2+) has been well documented, mechanisms involving dissolution processes of Fe(2+) in aqueous solutions have been overlooked. Here, the effect of dissolved organic ligands (EDTA (ethylenediaminetetraacetic acid), acetic, lactic and citric acids) on Fe(2+) solubility and on the stoichiometry (Fe(ii)/Fe(iii)) of magnetite–maghemite nanoparticles (∼10 nm) was investigated. These ligands were chosen because of their environmental relevance and because they are widely used as coating agents for nanotechnology applications. Results show an insignificant effect of 2 organic ligands (acetate and lactate) on the dissolution of Fe. By contrast, citrate and EDTA enhanced Fe solubility because of the formation of dissolved Fe(ii)– and Fe(iii)–ligand complexes. Both ligands selectively bound Fe(ii) over Fe(iii), but EDTA was much more selective than citrate. The combined effects of oxidation and H(+)- and ligand-promoted dissolution of Fe from magnetite were predicted using a magnetite–maghemite solid solution model, accounting for the formation of dissolved Fe(ii)– and Fe(iii)–ligand complexes. Therefore, these results show that citrate and EDTA (i) enhance Fe solubility in the presence of magnetite nanoparticles and (ii) modify magnetite stoichiometry, which affects its environmental behavior and its properties for nanotechnology applications. |
format | Online Article Text |
id | pubmed-10408591 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | RSC |
record_format | MEDLINE/PubMed |
spelling | pubmed-104085912023-08-09 Influence of organic ligands on the stoichiometry of magnetite nanoparticles Jungcharoen, Phoomipat Marsac, Rémi Choueikani, Fadi Masson, Delphine Pédrot, Mathieu Nanoscale Adv Chemistry Magnetite, a ubiquitous mineral in natural systems, is of high interest for a variety of applications including environmental remediation, medicine, and catalysis. If the transformation of magnetite to maghemite through the oxidation of Fe(2+) has been well documented, mechanisms involving dissolution processes of Fe(2+) in aqueous solutions have been overlooked. Here, the effect of dissolved organic ligands (EDTA (ethylenediaminetetraacetic acid), acetic, lactic and citric acids) on Fe(2+) solubility and on the stoichiometry (Fe(ii)/Fe(iii)) of magnetite–maghemite nanoparticles (∼10 nm) was investigated. These ligands were chosen because of their environmental relevance and because they are widely used as coating agents for nanotechnology applications. Results show an insignificant effect of 2 organic ligands (acetate and lactate) on the dissolution of Fe. By contrast, citrate and EDTA enhanced Fe solubility because of the formation of dissolved Fe(ii)– and Fe(iii)–ligand complexes. Both ligands selectively bound Fe(ii) over Fe(iii), but EDTA was much more selective than citrate. The combined effects of oxidation and H(+)- and ligand-promoted dissolution of Fe from magnetite were predicted using a magnetite–maghemite solid solution model, accounting for the formation of dissolved Fe(ii)– and Fe(iii)–ligand complexes. Therefore, these results show that citrate and EDTA (i) enhance Fe solubility in the presence of magnetite nanoparticles and (ii) modify magnetite stoichiometry, which affects its environmental behavior and its properties for nanotechnology applications. RSC 2023-07-19 /pmc/articles/PMC10408591/ /pubmed/37560422 http://dx.doi.org/10.1039/d3na00240c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Jungcharoen, Phoomipat Marsac, Rémi Choueikani, Fadi Masson, Delphine Pédrot, Mathieu Influence of organic ligands on the stoichiometry of magnetite nanoparticles |
title | Influence of organic ligands on the stoichiometry of magnetite nanoparticles |
title_full | Influence of organic ligands on the stoichiometry of magnetite nanoparticles |
title_fullStr | Influence of organic ligands on the stoichiometry of magnetite nanoparticles |
title_full_unstemmed | Influence of organic ligands on the stoichiometry of magnetite nanoparticles |
title_short | Influence of organic ligands on the stoichiometry of magnetite nanoparticles |
title_sort | influence of organic ligands on the stoichiometry of magnetite nanoparticles |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10408591/ https://www.ncbi.nlm.nih.gov/pubmed/37560422 http://dx.doi.org/10.1039/d3na00240c |
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