Abstract
Knowing the surface functional groups and free energy of adsorption are the most important factors affecting the adsorption capacity of granular activated carbon (GAC). The dispersion and specific interactions between hydrocarbon and GAC surface must be verified. This study used the Boehm titration to quantify the surface functional groups for four different GAC samples and the inverse gas chromatography to determine the free energy of adsorption. The result findings verified that the coconut-based GRW2 and TAS surfaces and mineral-based F400 surface can be considered more dominant basic functional group than total acidic functional group while the wood-based PIC surface has a very high acidic functional group. The ΔGoCxH2x value of understanding dispersion interaction may associate with the nature of raw GAC material and its surface chemical properties. The ΔGoπ value of understanding specific interaction depends on the surface physical and chemical properties of the GAC sample. The dispersion and specific interactions between either saturated or unsaturated hydrocarbon and GAC surface are verified to get better understanding of the design of porous material with multilevel energy for the novel technological applications.
Published Version
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