| 초록 |
The capacitive deionization (CDI) is considered a high efficiency desalination process. In this study, activated carbon fibers (ACFs) were modified by oxyfluorination using mixture gases of fluorine and oxygen with different conditions (partial pressure of F2: 0.1, 0.2, and 0.3 bar, total pressure: 1 bar) to decrease co-ion expulsion effect. The chemical composition changes of the untreated and oxyfluorinated ACFs were investigated using x-ray photoelectron spectroscopy. The textural properties of the prepared samples were confirmed via N2 adsorption at 77 K using a specific surface area and porosimetry analyzer. The CDI process was carried out at an electric potential of 0 ~ 1.2 V in 500 mg/L sodium chloride solution at 20 ml/min flow rate. The specific electrosorption capacity of optimized electrode (F2: 0.3 bar) was increased 116% compared to that of untreated electrode, because the co-ion expulsion effect was decreased by the fluorine and oxygen functional groups on the ACF. |
