Publication details

Využití Ramanovy spektroskopie při hodnocení bentonitu Sabenil

Title in English Application of Raman spectroscopy for evaluation of Sabenil bentonite

BEDNÁŘ Daniel ZEMAN Josef LOSOS Zdeněk

Year of publication 2018
Type Article in Periodical
Magazine / Source Zprávy o geologických výzkumech
MU Faculty or unit

Faculty of Science

Keywords Raman spectroscopy; bentonite; Sabenil; montmo­rillonite; anatas
Description Summary: Bentonite is a residual clayey rock created by mechanical and chemical weathering of parent rock in alkaline environment. The parent rocks are primarily volcanic tuffs, andesites, rhyolites and basalts. Bentonite is distinguished by high sorption capacity, high cation exchange value, low permeability, swelling and plasticity. The main mineral of bentonite is montmorillonite. The structure of montmorillonite is a combination of dioctahedral and tetrahedral layers and an interlayers with cations. Different types of bentonite have been studied for many decades and have found an application in wide range of fields, for example construction industry, chemical and food industry, even in pharmaceutical industry. Sabenil bentonite from Keramost a.s., so-called activated bentonite, was used for the research. In this type of bentonite, the amount of sodium cations is artificially increased by the addition of sodium carbonate. Raman spectroscopy is widely used by mineralogists for the study of minerals properties. It is fast non-destructive spectroscopic technique using monochromatic light of known wave length emitted by laser to observe vibrational and rotational spectra in molecules. Selected region for this research was between 70 and 750 cm-1. For selected samples, two mineral phases were detected using Raman spectroscopy. The first of these minerals was montmorillonite with peaks at ~ 93 cm-1, ~ 257 cm-1, ~ 196 cm-1, ~ 431 cm-1, ~ 602 cm-1, ~ 701 cm-1. The second phase was mineral anatase (TiO2) with peaks measured at ~ 145 cm-1, ~ 393 cm-1, ~ 516 cm-1 a ~ 636 cm-1. In contrast to Raman spectroscopy, the results of X-ray diffraction were added. In the case of selected samples, two other mineral phases were found by X-ray diffraction, namely calcite (CaCO3) and quartz (SiO2).

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