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Effects of metal cation substitution on hexavalent chromium reduction by green rust

Thomas, Andrew N.; Eiche, Elisabeth; Göttlicher, Jörg; Steininger, Ralph; Benning, Liane G.; Freeman, Helen M.; Tobler, Dominique J.; Mangayayam, Marco; Dideriksen, Knud; Neumann, Thomas

Abstract:
Chromium contamination is a serious environmental issue in areas affected by leather tanning and metal plating, and green rust sulfate has been tested extensively as a potential material for in situ chemical reduction of hexavalent chromium in groundwater. Reported products and mechanisms for the reaction have varied, most likely because of green rust’s layered structure, as reduction at outer and interlayer surfaces might produce different reaction products with variable stabilities. Based on studies of Cr(III) oxidation by biogenic Mn (IV) oxides, Cr mobility in oxic soils is controlled by the solubility of the Cr(III)-bearing phase. Therefore, careful engineering of green rust properties, i.e., crystal/particle size, morphology, structure, and electron availability, is essential for its optimization as a remediation reagent. In the present study, pure green rust sulfate and green rust sulfate with Al, Mg and Zn substitutions were synthesized and reacted with identical chromate (CrO₄²⁻) solutions. The reaction products were characterized by X-ray diffraction, pair distribution function analysis, X-ray absorption spectroscopy and transmission electron microscopy and treated with synthetic δ-MnO₂ to assess how easily Cr(III) in the products could be oxidized. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000117455
Veröffentlicht am 28.02.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 1467-4866
KITopen-ID: 1000117455
HGF-Programm 56.98.01 (POF III, LK 01)
Betrieb in MML
Erschienen in Geochemical transactions
Band 21
Heft 1
Seiten Art. Nr.: 2
Vorab online veröffentlicht am 14.02.2020
Schlagwörter Chromium, Green rust, X-ray absorption spectroscopy, Remediation
Nachgewiesen in Scopus
Web of Science
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