Birnessite: A New Oxidant for Green Rust Formation

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ID: 110525
2020
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Abstract
Iron and manganese are ubiquitous in the natural environment. FeII-FeIII layered double hydroxide, commonly called green rust (GR), and MnIII-MnIV birnessite (Bir) are also well known to be reactive solid compounds. Therefore, studying the chemical interactions between Fe and Mn species could contribute to understanding the interactions between their respective biogeochemical cycles. Moreover, ferromanganese solid compounds are potentially interesting materials for water treatment. Here, a {Fe(OH)2, FeIIaq} mixture was oxidized by Bir in sulphated aqueous media in the presence or absence of dissolved O2. In oxic conditions for an initial FeII/OH− ratio of 0.6, a single GR phase was obtained in a first step; the oxidation kinetics being faster than without Bir. In a second step, GR was oxidised into various final products, mainly in a spinel structure. A partial substitution of Fe by Mn species was suspected in both GR and the spinel. In anoxic condition, GR was also observed but other by-products were concomitantly formed. All the oxidation products were characterized by XRD, XPS, and Mössbauer spectroscopy. Hence, oxidation of FeII species by Bir can be considered as a new chemical pathway for producing ferromanganese spinels. Furthermore, these results suggest that Bir may participate in the formation of GR minerals.
Reference Key
doggaz2020materialsbirnessite: Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Amira Doggaz;Romain Coustel;Pierrick Durand;François Humbert;Christian Ruby;Doggaz, Amira;Coustel, Romain;Durand, Pierrick;Humbert, François;Ruby, Christian;
Journal Materials (Basel, Switzerland)
Year 2020
DOI
10.3390/ma13173777
URL
https://www.mdpi.com/1996-1944/13/17/3777/htm##B7-materials-13-03777
Keywords
oxidation layered double hydroxide iron manganese ldh fougerite oxidation layered double hydroxide iron manganese ldh fougerite National Center for Biotechnology Information NCBI NLM MEDLINE pubmed abstract nih national institutes of health national library of medicine pmid:32859087 doi:10.3390/ma13173777 amira doggaz romain coustel christian ruby

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