It was found that the contents of volatile compounds and flavor components were related to the type of cigarettes and the amount of tar. The contents of volatile compounds and flavor components were higher in the flue-cured cigarettes than in the mixed cigarettes, and higher in the high tar cigarettes than in the low tar cigarettes. The types of fragrance components in smoke of different types of cigarettes are basically the same, but there are great differences in content. The contents of furfural, furfuryl alcohol, maltol, 5-hydroxymethylfurfural, linolenic acid, methyl linolenic acid, linoleic acid, methyl palmitate and other components in flue-cured cigarettes were significantly higher than those in mixed cigarettes. This is related to the higher carbohydrate content in flue-cured cigarettes. Mixed-type cigarettes contain high content of 3-methylpentanoic acid and nitrogen heterocyclic compounds such as cotinine, ho ah, and methamine due to their formulations of burley tobacco and spice tobacco. The filtering law of activated carbon for different types of cigarettes is basically the same, that is, the filtering efficiency is related to the properties of compounds, especially with the molecular weight and boiling point of compounds. The filtration efficiency of activated carbon on flue-cured cigarettes was lower than that of mixed cigarettes.
The adsorption characteristics of pure acetone gas on activated carbon were measured. Langmuir model and Dubinin-Radushkevichv (D-R) model were used to fit the adsorption data, respectively. The Langmuir model and D-R model were compared from the Angle of model fitting accuracy and prediction of adsorption heat. Compared with Langmuir model, D-R model has higher fitting correlation coefficient and lower average relative standard deviation for adsorption data, so the fitting result is better. Based on 10-4-3 potential function, the theoretical adsorption heat of pure acetone gas on activated carbon is 17.9 kJ/mol, which is relatively small, indicating that the adsorption is mainly physical adsorption. The predicted value of adsorption heat of D-R model is 15.8kJ/mol, which is close to the theoretical calculated value, and the predicted value of adsorption heat of Langmuir model is 40.7 kJ/mol, which is much larger than the theoretical calculated value. It is found that the key to predict the filtration efficiency of different compounds is to predict the heat of adsorption of compounds. The filtration efficiency is mainly related to the adsorption temperature v, the amount of activated carbon, pore volume, molecular weight of the compound, collision diameter and energy parameters. The influence of pore size on filtration efficiency and adsorption selectivity can be obtained by analyzing adsorption energy.