Abstract
Adsorption of the components in the vapor phase of cigarette smoke by activated carbon fibers (ACF) with micropore radii from 8 to 29A was measured in order to study the relation between the adsorption efficiencies and the physical properties of ACFs. The adsorption efficiency increased with the size of the micropores and, with the exception of a few components, all ACFs have high adsorption ability for high boiling point components such as limonene. An ACF having a micropore radius of 8A showed an extremely low adsorption ability and an ACF having micropore radius of 10A uniformly adsorbed the components in the vapor phase. When compared with the semivolatile components, the molecular sieving effect and the competitive adsorption due to the difference of the boiling points were clearly observed. The competitive adsorption was thought to be the main reason for the dynamic change of adsorption with puffing. Consequently, the possibility was recognized that an increase in the amount of ACFs having wide micropores decreased the adsorption efficiency of the low boiling point components.
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