Infrared absorption spectra of some Manganese Dioxide Modifications and their thermal products

Abstract

The infrared absorption spectra of α‐, β‐, γ‐ and δ‐ MnO2 prepared by different methods, were measured and discussed. It was found that the ratio of absorbancies of the bands at 595 ± 20 cm−1 und 535 ± 20 cm−1 (φ) is related to the amorphous content. Each preparation is characterized by a certain value of φ. The mode of change of φ as a result of heating the different preparations is discussed. Infrared spectra help in differentiating α‐, γ and δ‐MnO2 on the one hand, and β‐MnO2 on the other, and in indicating the transformation of γ‐into β‐MnO2 by heating the former at 450 °C.

Cesium and cobalt adsorption on synthetic nano manganese oxide: A two dimensional infra-red correlation spectroscopic investigation

“…The synchronous spectrum of NMO laden with different Cs + contents is shown in The bands at 595±15 and 530±10 cm -1 have been related to the crystalline and amorphous contents of manganese oxide respectively [26]. This is consistent with the 2D analysis above that showed an increase in the band at 510 cm -1 and a decrease in the band at 600 cm -1 .…”

“…The other bands at 570, 520, 470 and 710 cm -1 have been reported to be characteristic bands of the  ,  and  oxide. The absence of a band at 665 cm -1 is indicative of the absence of  oxide [25,26]. The morphology of NMO was determined by SEM.…”

Photocatalytic Water Oxidation Using Manganese Compounds Immobilized in Nafion Polymer Membranes

“…Both spectra display a very broad stretch in the 700–750 cm −1 range, but few other diagnostic stretches between 700 and 900 cm −1 . The various forms of MnO 2 are known to display characteristic bands in the 400–700 cm −1 range, [39,40] which is outside the spectral window of our spectrometer. Similarly, the UV-visible spectrum of MnO 2 in Nafion lacks a characteristic absorbance feature, but the normalized post-illumination and authentic MnO 2 spectra shown in the inset of Fig.…”

Adsorption of Cesium, Cobalt, and Lead onto a Synthetic Nano Manganese Oxide: Behavior and Mechanism

“…The absence of a band at 665 cm −1 is indicative of the absence of β −phase. In addition, the absence of a band at 760 cm −1 is indicative of manganese oxide with layered structure in which the chains of edge-shared MnO 6 octahedral are infinite (Julien et al 2004;Kolta et al 1971;Kang et al 2007). Thus, based on the XRD and FT-IR analyses, it was confirmed that NMO in this work was mainly α −MnO 2 rather than other kinds of manganese oxides.…”