A study of the kinetics of isothermal nicotine desorption from silicon dioxide

作者：Adnadjevic Borivoj^*; Lazarevic Natasa; Jovanovic Jelena

来源：Applied Surface Science, 2010, 257(5): 1425-1430.

DOI：10.1016/j.apsusc.2010.08.055

• Nicotine
• Desorption
• Kinetics
• Silicon dioxide

The isothermal kinetics of nicotine desorption from silicon dioxide (SiO(2)) was investigated. The isothermal thermogravimetric curves of nicotine at temperatures of 115 degrees C, 130 degrees C and 152 degrees C were recorded. The kinetic parameters (E(a), lnA) 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, E(a,alpha) and lnA(alpha), 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.

• 出版日期2010-12-15