| 초록 |
In this study, the phenolic resin-based activated carbon fibers (ACFs) were ozonized in NaOH and H2O2 initiator solutions to modify the surface functional groups for the heavy metal ion adsorption. The surface properties of ACFs were investigated by FT-IR analysis. The adsorption isotherms of Cr(VI) and Cu(II) ion on ACFs have been studied in the 5 mg/l concentration at ambient temperature. N2/77K adsorption characteristics, including the specific surface area and micropore volume were studied by BET and t-plot methods, respectively. As a result, the surface functional groups were increased in the ozone treatment. And the amount and kinds of functional groups could be controlled by the ozone treatment in different initiators and initiator concentrations. Also, the adsorption capacity of ozonized ACFs for Cu(II) increased with the introduction of acidic functional groups, whereas the adsorption capacity for Cr(VI) increased at pHpHZPC. This is probably due to the repulsion forces between the newly formed negative charge on the surface of ACFs and negative Cr(VI) hydrate at pH>pHZPC. |
