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Clays and Clay Minerals

, Volume 58, Issue 5, pp 589–595 | Cite as

Preparation and Characterization of Magnetic Composites Based on a Natural Zeolite

  • Marlen GutiérrezEmail author
  • Mauricio Escudey
  • Juan Escrig
  • Juliano Denardin
  • Dora Altbir
  • Jose D. Fabris
  • Luis C. D. Cavalcante
  • María Teresa García-González
Article

Abstract

A magnetic composite was prepared by wet-impregnating a powder of a natural zeolite with a magnetic Fe oxide-containing synthetic material. Both starting materials were first characterized with X-ray diffraction, scanning electron microscopy, Mössbauer spectroscopy, and by isoelectric-point using vibrating-sample magnetometry. The synthetic Fe oxide-containing material was characterized as a mixture of magnetite (Fe3O4) and goethite (α-FeOOH). From the Fe Mössbauer analysis, the relative subspectral area for magnetite corresponds to 93(2)%; the remaining spectrum is assignable to goethite. After the impregnation process, magnetite was still identified in the composite material as a magnetic layer surrounding the zeolite particles; no magnetically ordered goethite could be detected. The Mössbauer pattern for this sample indicates a much more complex structure than for the precursor material, based on Fe oxides, with some more altered magnetite and an intense central doublet of (super)paramagnetic Fe3+, probably due to small Fe (hydr)oxides and/or to a residual contribution of Fe-bearing species from the starting zeolite material. The composite preparation procedure also promoted the change of the characteristic A-type zeolite to mordenite. The resulting magnetic composite presented a magnetic coercivity of as much as 0.140 A m−1, at 77 K. The final composite is now being evaluated as an adsorbent: results to date confirm that this novel magnetic material may have applications in the remediation of contaminated water bodies.

Key Words

Coercivity Fe Oxide Isoelectric Point Magnetite Magnetic Zeolite Mössbauer Spectroscopy 

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Copyright information

© Clay Minerals Society 2010

Authors and Affiliations

  • Marlen Gutiérrez
    • 1
    • 2
    Email author
  • Mauricio Escudey
    • 1
    • 2
  • Juan Escrig
    • 1
    • 2
  • Juliano Denardin
    • 1
    • 2
  • Dora Altbir
    • 1
    • 2
  • Jose D. Fabris
    • 3
  • Luis C. D. Cavalcante
    • 3
  • María Teresa García-González
    • 4
  1. 1.Universidad de Santiago de ChileSantiagoChile
  2. 2.Center for the Development of Nanoscience and NanotechnologyCEDENNASantiagoChile
  3. 3.Departmento de Quı´micaUniversidade Federal de Minas GeraisBelo HorizonteBrazil
  4. 4.Instituto de Ciencias Agrarias, Centro de Ciencias MedioambientalesConsejo Superior de Investigaciones CientíficasMadridSpain

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