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Journal of Nanomaterials
Volume 2013 (2013), Article ID 179794, 5 pages
http://dx.doi.org/10.1155/2013/179794
Research Article

Bentonite/Iron Oxide Composites: Preparation and Characterization by Hyperfine Methods

1Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 18000 Prague 8, Czech Republic
2Palacky University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic

Received 29 March 2013; Accepted 21 June 2013

Academic Editor: Oleg Petracic

Copyright © 2013 Petr Křišťan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Bentonite/iron oxide system is prepared by isothermal calcination of powder composed of bentonite clay and precursor containing ferric acetate. This preparation technique enables one to get the composite material directly, that is, iron oxide particles embedded in a bentonite matrix. Calcination temperature is varied from 320°C to 700°C. The resulting series of samples is characterized by local methods based on hyperfine interactions: 57Fe nuclear magnetic resonance (NMR) and the Mössbauer spectroscopy. The results show that the phase composition changes significantly in dependence on calcination temperature. The amount of maghemite phase rapidly increases up to °C and decreases abruptly for higher than 460°C.