Effect of gamma-irradiation on clays and organoclays: a Mossbauer and XRD study (Journal article)

Gournis, D./ Mantaka-Marketou, A. E./ Karakassides, M. A./ Petridis, D.

The interaction of gamma-rays with smectite clays induces noticeable changes in the structure and physicochemical properties of the minerals. For sodium-montmorillonite. Mossbauer spectra show that gamma-irradiation causes a partial reduction of trivalent iron to the divalent state due to hydrogen radicals production from the radiolysis of interlayer water. The XRD results show no change in the interlayer space upon irradiation and therefore the radiolysis of inter-layer water causes no measurable changes in the architectural organization of the interlayer environment. Intercalation of simple organic molecules (ethylene glycol, tert-butanol and tetraalkylammonium salts) causes partial oxidation of structural divalent iron and affects the Mossbauer parameters of the M-1 and M-2 ferric components Irradiation of ethylene glycol- or tert-butanol-clay composites indicates reduction of trivalent iron to the divalent state. XRD data show that the irradiation of clay-ethylene glycol complex causes collapse of the initial double layer of glycol molecules to a single layer complex. Finally, XRD results show that the effects of gamma-irradiation on clay-tetraalkylammonium complexes depend upon the chain length of the organic cations.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών
Keywords: gamma irradiation,clays,organoclays,mossbauer,xrd,dioctahedral smectites,montmorillonite,nanocomposites,spectroscopy,diffraction,nontronites
URI: https://olympias.lib.uoi.gr/jspui/handle/123456789/13864
ISSN: 0342-1791
Link: <Go to ISI>://000088845000009
Publisher: Springer-Verlag
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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