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On the state of iron in a clinoptilolite

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Abstract

The characterization of an iron-containing natural zeolitic sample from the deposit of Tasajeras (Cuba) has been carried out by means of X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS),57Fe Mössbauer spectroscopy and Fe K-edge X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). The results show that iron is mainly located (ca. 96%) as Fe3+ in an octahedral site of the clinoptilolite framework. No evidence of tetrahedrally coordinated Fe3+ was found. The remaining 4% Fe is located as Fe2+ in an extraframework octahedral site, probably as a solvated ion, within the clinoptilolite structure.

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Authors and Affiliations

  1. Instituto de Química-Física “Rocasolano”, CSIC, c/ Serrano, 119, 28006, Madrid, Spain

    J. F. Marco, M. Gracia & J. R. Gancedo

  2. Instituto de Ciencia de Materiales, CSIC, c/ Serrano, 115 bis, 28006, Madrid, Spain

    T. González-Carreño

  3. Instituto de Catàlisis, CSIC, Camino de Valdelatas s/n, 28049, Cantoblanco, Madrid, Spain

    A. Arcoya & X. L. Seoane

Authors
  1. J. F. Marco
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  2. M. Gracia
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  3. J. R. Gancedo
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  4. T. González-Carreño
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  5. A. Arcoya
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  6. X. L. Seoane
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Marco, J.F., Gracia, M., Gancedo, J.R. et al. On the state of iron in a clinoptilolite. Hyperfine Interact 95, 53–70 (1995). https://doi.org/10.1007/BF02146305

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