Authors
Rongrong Ding, Carolina Guida, Carolyn I Pearce, Elke Arenholz, Jean-Marc Grenèche, Alexandre Gloter, Andreas C Scheinost, Kristina O Kvashnina, Kaifeng Wang, Alejandro Fernandez-Martinez, Yang Mu, Kevin M Rosso, Laurent Charlet
Published in
Science advances. Volume 11. Issue 20. Pages eadq3650. May 16, 2025. Epub May 16, 2025.
Abstract
Understanding the redox transitions that control rhenium geochemistry is central to paleoredox and geochronology studies, as well as predicting the fate of chemically similar hazardous oxyanions in the environment such as pertechnetate. However, detailed mechanistic information regarding rhenium redox transitions in anoxic systems is scarce. Here, we performed a comprehensive laboratory study of rhenium redox transitions on variably oxidized magnetite nanoparticle surfaces. Through high-end spectroscopic and microscopic tools, we propose an abiotic transition pathway in which aqueous iron(II) ions in the presence of pure or preoxidized magnetite serve as an electron source to reduce rhenium(VII) to individual rhenium(IV) atoms or small polynuclear species on nanoparticle surfaces. Notably, iron(II) ions recharged preoxidized magnetite nanoparticles exhibit a maghemite core and a magnetite shell, challenging the traditional core-shell magnetite-maghemite model. This study provides a fundamental understanding of redox processes governing rhenium fate and transport in the environment and enables an improved basis for predicting its speciation in geochemical systems.
PMID:
40378223
Bibliographic data and abstract were imported from PubMed on 17 May 2025.
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