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Clays and Clay Minerals; February 2007; v. 55; no. 1; p. 89-95; DOI: 10.1346/CCMN.2007.0550107
© 2007 Clay Minerals Society
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INCORPORATION OF Fe IN THE INTERLAYER OF Na-BENTONITE VIA TREATMENT WITH FeCl3 IN ACETONE

Andrea Komlósi1, Ernö Kuzmann2, Noémi M. Nagy1,*, Zoltán Homonnay2, Shiro Kubuki2,{dagger} and József Kónya1

1 Isotope Laboratory, Department of Colloid and Environmental Chemistry, University of Debrecen, Debrecen, 4010 PO Box 8, Hungary
2 Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences, Eötvös Loránd University, Pázmány P. s. 1/a, Budapest 1117, Hungary

* E-mail address of corresponding author: noemi{at}tigris.unideb.hu

The effect of FeCl3 in acetonic medium on the structure of Na-bentonite was studied using X-ray diffraction (XRD), 57Fe Mössbauer spectroscopy, X-ray fluorescence spectroscopy and infrared spectroscopy to describe the structure of the bentonite before and after treatment. In the samples treated with FeCl3, an increase in the basal spacing was found by XRD, while a new magnetically split component assigned to Fe3+ incorporated within the interlayer regions of montmorillonite showed up in the low-temperature Mössbauer spectra. The Mössbauer parameters observed were close to those of Fe oxyhydroxides, suggesting the presence of some kind of nanoparticles. These results show that the treatment with acetonic FeCl3 solution is an effective method for introducing Fe into montmorillonite in the form of Fe3+ accommodated in the interlayer region. The treated samples proved to be efficient Lewis catalysts in the acylation of aldehydes (benzaldehyde and 4-OH-benzaldehyde) by acetic acid anhydride.

Key Words: Bentonite • Clay • Interlayer • Iron • Infrared Spectroscopy • Mössbauer Spectroscopy • XRD • XRF






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