PittsburghV1, France, Analysis, bibRecord, 000330

Fe(II) Uptake on Natural Montmorillonites. I. Macroscopic and Spectroscopic Characterization

Identifieur interne : 000330 ( France/Analysis ); précédent : 000329; suivant : 000331

Fe(II) Uptake on Natural Montmorillonites. I. Macroscopic and Spectroscopic Characterization

Auteurs : Daniela Soltermann [Suisse] ; Maria Marques Fernandes [Suisse] ; Bart Baeyens [Suisse] ; Rainer Dahn [Suisse] ; Prachi A. Joshi [États-Unis] ; Andreas C. Scheinost [Allemagne, France] ; Christopher A. Gorski [États-Unis]

Source :

Environmental science & technology [ 0013-936X ] ; 2014.

RBID : Pascal:15-0042086

Descripteurs français

Pascal (Inist)
- Complexation, Etude expérimentale, Fer ferreux, Fer ferrique, Modèle, Montmorillonite, Sorption, Etude expérimentale, Spectre Mössbauer, Spectre RX.

English descriptors

KwdEn :
- Mossbauer spectra, X-ray spectra, complexing, experimental studies, ferric iron, ferrous iron, models, montmorillonite, sorption.

Abstract

Iron is an important redox-active element that is ubiquitous in both engineered and natural environments. In this study, the retention mechanism of Fe(II) on clay minerals was investigated using macroscopic sorption experiments combined with Mössbauer and extended X-ray absorption fine structure (EXAFS) spectroscopy. Sorption edges and isotherms were measured under anoxic conditions on natural Fe-bearing montmorillonites (STx, SWy, and SWa) having different structural Fe contents ranging from 0.5 to 15.4 wt % and different initial Fe redox states. Batch experiments indicated that, in the case of low Fe-bearing (STx) and dithionite-reduced clays, the Fe(II) uptake follows the sorption behavior of other divalent transition metals, whereas Fe(II) sorption increased by up to 2 orders of magnitude on the unreduced, Fe(III)-rich montmorillonites (SWy and SWa). Mössbauer spectroscopy analysis revealed that nearly all the sorbed Fe(II) was oxidized to surface-bound Fe(III) and secondary Fe(III) precipitates were formed on the Fe(III)-rich montmorillonite, while sorbed Fe is predominantly present as Fe(II) on Fe-low and dithionite-reduced clays. The results provide compelling evidence that Fe(II) uptake characteristics on clay minerals are strongly correlated to the redox properties of the structural Fe(III). The improved understanding of the interfacial redox interactions between sorbed FE(II) and clay minerals gained in this study is essential for future studies developing Fe(II) sorption models on natural montmorillonites.

Affiliations:

Links to Exploration step

Pascal:15-0042086

Le document en format XML

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<front><div type="abstract" xml:lang="en">Iron is an important redox-active element that is ubiquitous in both engineered and natural environments. In this study, the retention mechanism of Fe(II) on clay minerals was investigated using macroscopic sorption experiments combined with Mössbauer and extended X-ray absorption fine structure (EXAFS) spectroscopy. Sorption edges and isotherms were measured under anoxic conditions on natural Fe-bearing montmorillonites (STx, SWy, and SWa) having different structural Fe contents ranging from 0.5 to 15.4 wt % and different initial Fe redox states. Batch experiments indicated that, in the case of low Fe-bearing (STx) and dithionite-reduced clays, the Fe(II) uptake follows the sorption behavior of other divalent transition metals, whereas Fe(II) sorption increased by up to 2 orders of magnitude on the unreduced, Fe(III)-rich montmorillonites (SWy and SWa). Mössbauer spectroscopy analysis revealed that nearly all the sorbed Fe(II) was oxidized to surface-bound Fe(III) and secondary Fe(III) precipitates were formed on the Fe(III)-rich montmorillonite, while sorbed Fe is predominantly present as Fe(II) on Fe-low and dithionite-reduced clays. The results provide compelling evidence that Fe(II) uptake characteristics on clay minerals are strongly correlated to the redox properties of the structural Fe(III). The improved understanding of the interfacial redox interactions between sorbed FE(II) and clay minerals gained in this study is essential for future studies developing Fe(II) sorption models on natural montmorillonites.</div>
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Fe(II) Uptake on Natural Montmorillonites. I. Macroscopic and Spectroscopic Characterization

Fe(II) Uptake on Natural Montmorillonites. I. Macroscopic and Spectroscopic Characterization

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Descripteurs français

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Abstract

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