Tin-clay complexes: A Mossbauer study (Journal article)

Petridis, D./ Bakas, T.

Divalent tin has been intercalated into montmorillonite by reacting partially hydrolyzed solutions of SnCl2 under aerobic conditions at pH = 2.8 with aqueous dispersions of the smectite mineral. The precursor tin solution contains mainly the cationic trimeric ion Sn-3(OH)(4)(2+), which is shown to take part in the exchange reactions with the surface cations of the mineral. Variable temperature Mossbauer spectroscopy was used in order to: 1) directly probe changes in the oxidation state and coordination environment of Sn2+ in the process of intercalation; 2) examine the nature of tin atoms on the external surfaces and in the interlayer space of the clay platelets; and 3) study the dynamics of motion of tin atoms on the clay surfaces. The main conclusion from these studies is that about 75% of the Sn2+ ions undergo extensive oxidation to the +4 state with concomitant hydrolysis and condensation that lead to the precipitation of SnO2 on the external surfaces of the clay. The rest of the Sn2+ ions are introduced into the lamellar zone, as evidenced by the detailed Mossbauer analysis of the dynamics of motion of tin atoms on the clay surfaces.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
Keywords: clay,montmorillonite,mossbauer,intercalation
URI: https://olympias.lib.uoi.gr/jspui/handle/123456789/16050
ISSN: 0009-8604
Link: <Go to ISI>://A1997XB13300008
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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