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Interaction of ammonium with birnessite: Evidence of a chemical and structural transformation in alkaline aqueous medium

Abstract : The ammonium cation interaction with Na-birnessite in aqueous alkaline medium was studied. Solution and solid analysis give evidence that birnessite is not only acting as a cationic exchanger toward NH4+. The surface analysis performed by XPS showed that N1s spectra are characterized by the existence of two different environments: one assignable to an interlayer NH4+ and the second to a chemisorbed N-species. Structural and chemical transformations were observed on birnessite with nitrogen mass balance deficit. The monitoring of NH4 +, Na+, Mn2+, NO3- and NO2- and solid changes (average oxidation state of Mn, cation exchange capacity, solid nitrogen content and symmetry evolution identified by XRD and FTIR) indicate unambiguously that NH4+ reacts chemically with the birnessite.
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https://hal.univ-lorraine.fr/hal-01767742
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Submitted on : Wednesday, June 22, 2022 - 7:51:51 PM
Last modification on : Friday, June 24, 2022 - 3:32:41 AM
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Hella Boumaiza, Romain Coustel, Christelle Despas, Christian Ruby, Latifa Bergaoui. Interaction of ammonium with birnessite: Evidence of a chemical and structural transformation in alkaline aqueous medium. [Research Report] CNRS Université de Lorraine. 2018, pp.543 - 550. ⟨hal-01767742⟩

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