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Effect of sonication on the thermal decomposition of ammonium vermiculite as studied by TG-MS hyphenated technique

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Abstract

The thermal decomposition of the ammonium exchanged vermiculite takes place in three steps. A strong correlation exists between the mass loss of ammonia and water suggesting a simultaneous release. It is proposed that proton transfer from the ammonium ion to the hydroxyl units results in this simultaneous release. This behaviour could be explained by a mechanism where a resulting proton, produced by the release of ammonia out of ammonium cation, combines with a structural hydroxyl to form water. Sonication produces a substantial reduction in the particle size of the vermiculite sample. Thus, the macroscopic particle size of the untreated material is drastically reduced to the micrometers range while the structure as assayed by XRD remains unchanged. The particle size reduction produced by the sonication treatment modifies the thermal decomposition profile, mainly the mass percentages of the different steps.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales de Sevilla, C.S.I.C. and Universidad de Sevilla, Isla de la Cartuja, 41092, Sevilla, Spain

    L. A. Pérez-Maqueda, J. Poyato & J. L. Pérez-Rodríguez

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  1. L. A. Pérez-Maqueda
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  2. J. Poyato
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  3. J. L. Pérez-Rodríguez
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Pérez-Maqueda, L.A., Poyato, J. & Pérez-Rodríguez, J.L. Effect of sonication on the thermal decomposition of ammonium vermiculite as studied by TG-MS hyphenated technique. Journal of Thermal Analysis and Calorimetry 78, 375–383 (2004). https://doi.org/10.1023/B:JTAN.0000046104.93373.a9

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  • DOI: https://doi.org/10.1023/B:JTAN.0000046104.93373.a9

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