Conditions for the formation of pure birnessite during the oxidation of Mn(II) cations in aqueous alkaline medium

Abstract : Birnessite was synthetized through redox reaction by mixing MnO4-, Mn2+ and OH- solutions. The Mn(VII): Mn(II) ratio of 0.33 was chosen and three methods were used consisting in a quick mixing under vigorous stirring of two of the three reagents and then on the dropwise addition of the third one. The obtained solids were characterized by XRD, FTIR and XPS spectroscopies. Their average oxidation states were determined from ICP and CEC measurements while their surface properties were investigated by XPS. This study provides an increased understanding of the importance of dissolved oxygen in the formation of birnessite and hausmannite and shows the ways to obtain pure birnessite. The role of counter-ion ie. Na+ or K+ was also examined.
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https://hal.univ-lorraine.fr/hal-01767811
Contributor : Romain Coustel <>
Submitted on : Monday, April 16, 2018 - 3:42:06 PM
Last modification on : Wednesday, September 4, 2019 - 2:06:03 PM

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Hella Boumaiza, Romain Coustel, Ghouti Medjahdi, Christian Ruby, Latifa Bergaoui. Conditions for the formation of pure birnessite during the oxidation of Mn(II) cations in aqueous alkaline medium. Journal of Solid State Chemistry, Elsevier, 2017, 248, pp.18 - 25. ⟨10.1016/j.jssc.2017.01.014⟩. ⟨hal-01767811⟩

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