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Thermal characterization of ammonium alum

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Abstract

Thermal decomposition of ammonium alum was studied by simultaneous thermogravimetry (TG)-differential scanning calorimetry (DSC) attached to a Fourier transform infrared (FTIR) spectrometer, so that each mass loss was related with the simultaneous endo- or exothermal behavior and to the FTIR absorption produced by the evolved gases. Apart from some clear dehydration and desulfation processes, other overlapping peaks were observed by DSC, TG, and FTIR. Optimal fitting to logistic mixture models was performed to separate the overlapping processes. Deconvolution of overlapping DTG peaks resulted in single constituent peaks, which were related to plots of some specific FTIR bands along time. Thus, a more accurate insight of the chemical processes taking place was obtained.

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Acknowledgements

The first, third, fourth, and fifth authors acknowledge the Spanish Ministerio de Ciencia e Innovación for the provision of funds MTM2008-00166.

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Authors and Affiliations

  1. Escola Politécnica Superior, University of A Coruña, Avda. Mendizábal s/n, 15403, Ferrol, Spain

    Jorge López-Beceiro, Ramón Artiaga, Javier Tarrío-Saavedra & Salvador Naya

  2. Departamento de Ingeniería Civil, de Materiales y Fabricación, E.T.S.I.I. Universidad de Málaga, Campus de Teatinos, Málaga, Spain

    José Pascual-Cosp

Authors
  1. Jorge López-Beceiro
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  2. José Pascual-Cosp
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  3. Ramón Artiaga
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  4. Javier Tarrío-Saavedra
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  5. Salvador Naya
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Correspondence to Javier Tarrío-Saavedra.

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López-Beceiro, J., Pascual-Cosp, J., Artiaga, R. et al. Thermal characterization of ammonium alum. J Therm Anal Calorim 104, 127–130 (2011). https://doi.org/10.1007/s10973-010-1189-7

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  • DOI: https://doi.org/10.1007/s10973-010-1189-7

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