| 초록 |
Perfluorooctanoic acid (PFOA) and perfluorooctyl sulfonate (PFOS) is a new persistent organic pollutants of substantial environmental concern. This study investigated the potential of magnetic ion exchange resin (MIEX $^{(R)}$ ) as the adsorbent for the removal of PFOA and PFOS from Nakdong River water. In our batch experiments, we studied the effect of some parameters (pH, temperature, sulfate concentration) on the removal of PFOA and PFOS. The results of sorption kinetics on MIEX $^{(R)}$ show that it takes 90 min to reach equilibrium but the economical contact time and dosage were 30 min and 10 mL/L. An increase in pH (pH 6~10) leads to a decrease in PFOA (2.0%) and PFOS (3.6%) sorption on MIEX $^{(R)}$ . The sorption of both PFOA and PFOS decreases with an increase in ionic strength for sulfate ion ( ${SO_4}^{2-}$ ), due to the competition phenomenon. An increase in water temperature ( $8^{ circ}C{ sim}28^{ circ}C$ ) in water leads to a increase in PFOA (2.8%) and PFOS (4.3%) sorption on MIEX $^{(R)}$ . Based on the sorption behaviors and characteristics of the adsorbents and adsorbates, ion exchange and hydrophobic interaction were deduced to be involved in the sorption, and hemi-micelles possibly formed in the intraparticle pores. |
