Birnessite type layered MnO6 oxides with increased crystallinity were synthesized from six carbohydrates and three dihydric phenols viz., dextrose, starch, fructose, galactose, maltose, lactose, catechol, resorcinol, quinol and KMnO4 through the formation of a sol–gel. All of the MnO6 oxides were characterized by powder XRD. The strong signal at 2θ ~ 12° corresponding to 7.4 Å refers to the Mn–Mn distance between the adjacent layers. The interlayer volume is dispersed with K+ ions and H2O molecules. The presence of interlayer K+ ions is indicated by a signal at 25°, corresponding to a distance of 3.5 Å. IR spectra of the oxides show signature bands at ca. 500 cm−1 due to the stretching modes occurring for MnO6 entity. A broad band observed at ca. 3300 cm−1 is due to interlayer water molecules. Thermal analysis indicated three stage decomposition with the formation of MnO2 at ca. 600 °C through the intermediate formation of Mn(OH) n . The MnO6 exhibited a remarkable CO2 scrubbing ability, which has also been investigated.
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Ramalingam, K., Kamatchi, T. & Sumod, P.A. Synthesis, Spectral, Thermal and CO2 Absorption Studies on Birnessites Type Layered MnO6 Oxide. Transition Met Chem 31, 429–433 (2006). https://doi.org/10.1007/s11243-006-0004-6