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ChemInform Abstract: Crystallization of Sodium Birnessite and Accompanied Phase Transformation.

✍ Scribed by J. LUO; A. HUANG; S. H. PARK; S. L. SUIB; C.-L. O'YOUNG

Publisher
John Wiley and Sons
Year
2010
Weight
37 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

The crystallization of sodium birnessite (III) and accompanying phase transformations are studied by XRD, IR and SEM. The synthesis procedure contains three steps: formation of Mn(OH) 2 , oxidation of Mn(OH) 2 to a MnOx suspension by KMnO 4 and aging of the MnOx suspension to form birnessite. The crystallization of birnessite is accompanied by the crystallization and phase transformation of feitknechtite (Ξ²-MnOOH). Temperature and MnO -4 /Mn 2+ ratio strongly effect the crystallization process. A possible route and mechanism for the formation of birnessite from MnOx gel via buserite as a short-lived precursor is proposed. -(LUO,

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