STUDIES OF THE SURFACE HETEROGENEITY OF CHEMICALLY MODIFIED POROUS CARBONS BY GAS SOLID CHROMATOGRAPHY

Adsorbents are prepared by grafting four different benzoylsiloxanes to the surface of Carbopack B porous carbon. The energetic heterogeneities of these chemically modified materials along with the unmodified carbon are studied by gas chromatography (GC) using simple normal hydrocarbon and aromatic solute probes. The grafted materials are energetically more heterogeneous than the original unmodified carbon. Further, the degree of heterogeneity depends not only on the immobilized ligand type, but also on its surface concentration.