Sol−Gel Synthesis of Layered Birnessite-Type Manganese Oxides

Autor:	Steven L. Suib, Stanton Ching, Matthew L. Jorgensen, Diana J. Petrovay
Rok vydání:	1997
Předmět:	Auger electron spectroscopy Birnessite Aqueous solution Chemistry Scanning electron microscope Inorganic chemistry chemistry.chemical_element Microporous material Manganese engineering.material Inorganic Chemistry engineering Cryptomelane Physical and Theoretical Chemistry Sol-gel
Zdroj:	Inorganic Chemistry. 36:883-890
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic961088d
Popis:	Layered birnessite-type manganese oxides have been synthesized by sol−gel reactions involving KMnO4 or NaMnO4 with glucose. These microporous manganese oxides are designated as octahedral layer materials, K-OL-1 and Na-OL-1, because their layered structure consists of edge-shared MnO6 octahedra. The interlayer regions are occupied by alkali metal cations and water molecules. K-OL-1 and Na-OL-1 have been characterized by elemental analysis, powder X-ray diffraction, scanning electron microscopy, FT-IR spectroscopy, and Auger electron spectroscopy. The empirical formula of K-OL-1 has been determined to be K0.28MnO1.96(H2O)0.19. An interlayer spacing of 7 A, typical of natural and synthetic birnessites, has been measured by X-ray diffraction. The sol−gel synthesis of K-OL-1 is carried out with concentrated aqueous solutions of glucose and KMnO4 in a 1.5:1 mole ratio. Diluted reaction mixtures produce flocculent gels or precipitates which yield other manganese oxide phases such as cryptomelane and Mn2O3. The ...
Databáze:	OpenAIRE
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