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Constant rate thermal analysis of cobaltoblödite and cupper–kröhnkite at low water vapor pressure 5 hPa

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Abstract

Thermal decomposition mechanisms for cobaltoblödite Na2Co(SO4)2·4H2O and cupper–kröhnkite Na2Cu(SO4)2·2H2O have been developed using constant rate thermal analysis technique under controlled residual water vapor pressure above the sample \( P_{{{\text{H}}_{2} {\text{O}}}} = \, 5\;{\text{hPa}} \). The apparent activation energy of each dehydration process was measured by means of two CRTA curves without any presumption to the kinetic low. Correlation between structure and thermal behavior was highlighted. It has shown that dehydration of cobaltoblödite mineral occurs in two steps with formation of Na2Co(SO4)2·1.5H2O and Na2Co(SO4)2 as intermediate and final phases, respectively. The activation energies of both dehydration steps are 167 kJ mol−1 and 107 kJ mol−1, respectively. For cupper–kröhnkite mineral, its dehydration occurs in one step leading to Na2Cu(SO4)2. The corresponding activation energy was found equal to 71 kJ mol−1.

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Acknowledgements

Funding was provided by Ministry of Higher Education and Scientific Research.

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Authors and Affiliations

  1. Laboratoire d’Application de la Chimie aux Ressources et Substances Naturelles et à l’Environnement (LACReSNE), Faculté des Sciences de Bizerte, Université de Carthage, 7021, Zarzouna, Bizerte, Tunisia

    Olfa Bejaoui, Lotfi Zayani & Dalila Ben Hassen Chehimi

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  1. Olfa Bejaoui
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  2. Lotfi Zayani
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  3. Dalila Ben Hassen Chehimi
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Correspondence to Olfa Bejaoui.

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Bejaoui, O., Zayani, L. & Chehimi, D.B.H. Constant rate thermal analysis of cobaltoblödite and cupper–kröhnkite at low water vapor pressure 5 hPa. J Therm Anal Calorim 137, 25–31 (2019). https://doi.org/10.1007/s10973-018-7921-4

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  • DOI: https://doi.org/10.1007/s10973-018-7921-4

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