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Thermochemical and kinetic investigations of amorphous silica dissolution in NaOH solutions

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Abstract

Dissolution of amorphous silica in 4, 8 and 11 mass% of sodium hydroxide solutions was followed by microcalorimetry at temperature between 353.15 and 403.15 K. Decreasing the Na2O/SiO2 molar ratio leads to the successive formation of the following dissolved entities Si4O11Na6, Si2O5Na2, Si3O7Na2 and Si5O11Na2. Their formation enthalpies were determined at 393.15 K as −5640.8, −2492.2, −3401.8 and −5214.7 kJ mol−1, respectively. A kinetic investigation showed that dissolution cannot be described by one-step controlled process. Isoconversional model allows determining a complex variation in the activation energy of dissolution in the range 6–21 kJ mol−1.

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Authors and Affiliations

  1. Faculté des Sciences de Tunis, Chemistry Department, LR01SE10 Applied Thermodynamics Laboratory, Université de Tunis El Manar, 2092, Tunis, Tunisia

    Meriem Fertani-Gmati & Mohamed Jemal

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  1. Meriem Fertani-Gmati
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  2. Mohamed Jemal
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Correspondence to Mohamed Jemal.

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Fertani-Gmati, M., Jemal, M. Thermochemical and kinetic investigations of amorphous silica dissolution in NaOH solutions. J Therm Anal Calorim 123, 757–765 (2016). https://doi.org/10.1007/s10973-015-4980-7

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  • DOI: https://doi.org/10.1007/s10973-015-4980-7

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