An investigation of the interaction of activated carbon and organicsolvents by Inverse Gas and Liquid Chromatography

摘要

For many applications it is desirable to study the energy distribution for different adsorption sites (surface heterogeneity). In the case ofrnactivated carbon this is particularly useful for the understanding of changes in surface chemistry due to surface modification andrnactivation processes. In this study an acidic and basic probe molecule (Dichloromethane and Ethyl acetate) are used to achieve a betterrnunderstanding of the surface chemistry. IGC and ILC experiments are conducted for a comparison of the adsorption properties in thernliquid and vapour phase.rnExperimental results from both techniques suggest a stronger interaction of F400 with the acidic probe molecule while the interactionrnwith the basic adsorbate is quite similar for both activated carbons. This indicates a difference in the basic surface groups for the tworncarbons. The total values of the adsorption potentials are smaller for the ILC experiments, probably due to a non-negligible uptake of thernmobile phase (hexane).