Speciation and Crystal Chemistry of Iron(III) Chloride Hydrolyzed in the Presence of SiO4 Ligands. 1. An Fe K-Edge EXAFS Study
Abstract
The hydrolysis of Fe−Si systems with Si/Fe ratios between 0 and 4 leads to the formation of poorly crystalline or, more frequently, of long-range disorganized precipitates. The increase of Si/Fe molar ratios results in an dramatic change of Fe polymerization. The formation of double and single corner-sharing Fe linkages is reduced compared to pure Fe hydrolysis products. The growth regime depends on the Si concentration in the system. Three-dimensional and two-dimensional growth of Fe colloids occurs at low and high Si/Fe ratios, respectively, systems with Si/Fe ratios around 1 representing a crossover between these two regimes. Though Si neighbors cannot be detected unequivocally by Fe K-edge EXAFS, their presence in the close environment of Fe atoms is evident from the change in Fe speciation.
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- Authors
- Doelsch, E., Rose, J., Masion, A., Bottero, J. Y., Nahon, D., & Bertsch, P. M.
- Affiliations
- CEREGE (UMR 6635, CNRS-Aix-Marseille III), Europole Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 04, France, and Savannah River Ecology Laboratory, AACES, University of Georgia, PO Drawer E, Aiken, South Carolina 29802
- Centre National de la Recherche Scientifique (FR)
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-04-21
- Volume
- 16
- Issue
- 10
- Pages
- 4726-4731
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W1986293997
- Cited by
- 101
- References
- 27
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 1 · 2023: 2 · 2022: 4 · 2021: 2 · 2020: 5 · 2019: 8 · 2018: 4 · 2017: 8 · 2016: 6 · 2015: 5 · 2014: 4 · 2013: 4 · 2012: 4
- FWCI
- 4.88
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Langmuir (publishedVersion)
- HAL AMU (submittedVersion)
- Funders
- U.S. Department of Energy (FC09-96SR18546)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Iron oxide chemistry and applications
- Physical Sciences › Physics and Astronomy › Radiation › X-ray Spectroscopy and Fluorescence Analysis
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Keywords
- Fe-Si system, crystal chemistry, Fe K-edge EXAFS, precipitate morphology
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