Oxidation State and Structure of Fe in Nontronite: From Oxidizing to Reducing Conditions.
Journal
ACS earth & space chemistry
ISSN: 2472-3452
Titre abrégé: ACS Earth Space Chem
Pays: United States
ID NLM: 101695267
Informations de publication
Date de publication:
19 Oct 2023
19 Oct 2023
Historique:
received:
19
05
2023
revised:
30
08
2023
accepted:
30
08
2023
medline:
26
10
2023
pubmed:
26
10
2023
entrez:
26
10
2023
Statut:
epublish
Résumé
The redox reaction between natural Fe-containing clay minerals and its sorbates is a fundamental process controlling the cycles of many elements such as carbon, nutrients, redox-sensitive metals, and metalloids (e.g., Co, Mn, As, Se), and inorganic as well as organic pollutants in Earth's critical zone. While the structure of natural clay minerals under oxic conditions is well-known, less is known about their behavior under anoxic and reducing conditions, thereby impeding a full understanding of the mechanisms of clay-driven reduction and oxidation (redox) reactions especially under reducing conditions. Here we investigate the structure of a ferruginous natural clay smectite, nontronite, under different redox conditions, and compare several methods for the determination of iron redox states. Iron in nontronite was gradually reduced chemically with the citrate-bicarbonate-dithionite (CBD) method.
Identifiants
pubmed: 37881367
doi: 10.1021/acsearthspacechem.3c00136
pmc: PMC10594735
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1868-1881Informations de copyright
© 2023 The Authors. Published by American Chemical Society.
Déclaration de conflit d'intérêts
The authors declare no competing financial interest.
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