Birnessite: A New Oxidant for Green Rust Formation
| Autor: | François Humbert, Pierrick Durand, Romain Coustel, Amira Doggaz, Christian Ruby |
|---|---|
| Přispěvatelé: | Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Cristallographie, Résonance Magnétique et Modélisations (CRM2), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
layered double hydroxide
Birnessite LDH oxidation Kinetics Inorganic chemistry chemistry.chemical_element 02 engineering and technology Manganese 010501 environmental sciences engineering.material Fougèrite 01 natural sciences Ferromanganese lcsh:Technology Article chemistry.chemical_compound iron Mössbauer spectroscopy [CHIM]Chemical Sciences General Materials Science lcsh:Microscopy 0105 earth and related environmental sciences lcsh:QC120-168.85 lcsh:QH201-278.5 Chemistry lcsh:T Spinel 021001 nanoscience & nanotechnology 6. Clean water fougerite lcsh:TA1-2040 [SDE]Environmental Sciences engineering manganese Hydroxide lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials, Vol 13, Iss 3777, p 3777 (2020) Materials Volume 13 Issue 17 Materials, MDPI, 2020, 13 (17), pp.3777. ⟨10.3390/ma13173777⟩ |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13173777⟩ |
| Popis: | 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&minus 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 Mö ssbauer 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|