Abstract
The preparation of a novel carbon monolithic column for high performance liquid chromatography is described. A phenolic resin rod with embedded 10-μm silica beads was prepared by acid-catalyzed polymerization of a resorcinol/ iron(III) complex and formaldehyde. This rod was carbonized and graphitized under inert atmosphere with a programmed temperature cycle from room temperature to 1250 °C. Subsequently, the silica beads along with iron catalysts were removed, leaving a porous carbon rod. Imaging of this monolithic rod by scanning and transmission electron microscopies revealed a highly interconnected bimodal porous structure. The porosity and pore size distribution of the mesopores were characterized by N2 absorption/desorption. Graphene sheets were found in the TEM images of the carbon rod, and the graphite index was characterized by Raman spectrum and X-ray diffraction. A monolithic column prepared with the aforementioned carbon rod was evaluated using a mixture of alkylbenzenes. It exhibited an excellent separation power and a low hydraulic resistance. The bundle-of-capillaries model was used to characterize the hydrodynamics of this monolith. Its permeability was found to agree well with the theoretical one.
| Original language | English |
|---|---|
| Pages (from-to) | 4904-4912 |
| Number of pages | 9 |
| Journal | Analytical Chemistry |
| Volume | 75 |
| Issue number | 18 |
| DOIs | |
| State | Published - Sep 15 2003 |