A study of the kinetics of isothermal nicotine desorption from silicon dioxide |
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Authors: | Borivoj Adnadjevic Natasa Lazarevic |
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Institution: | a Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11001 Belgrade, Serbia b Nuclear Facilities of Serbia, Mike Petrovica Alasa 12-14, 11351 Belgrade, Vinca, Serbia |
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Abstract: | The isothermal kinetics of nicotine desorption from silicon dioxide (SiO2) was investigated. The isothermal thermogravimetric curves of nicotine at temperatures of 115 °C, 130 °C and 152 °C were recorded. The kinetic parameters (Ea, ln A) of desorption of nicotine were calculated using various methods (stationary point, model constants and differential isoconversion method). By applying the “model-fitting” method, it was found that the kinetic model of nicotine desorption from silicon dioxide was a phase boundary controlled reaction (contracting volume). The values of the kinetic parameters, Ea,α and ln Aα, complexly change with changing degree of desorption and a compensation effect exists. A new mechanism of activation for the desorption of the absorbed molecules of nicotine was suggested in agreement with model of selective energy transfer. |
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Keywords: | Nicotine Desorption Kinetics Silicon dioxide |
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