| 초록 |
During the treatment of drinking water, chlorination leads to the degradation of bisphenol A (BPA) and the formation of chlorinated derivatives (ClxBPA). ClxBPA has higher estrogenic activity than BPA, and it has been detected in environmental aqueous media, human urine, serum, adipose, and placental tissue. With the pressure to limit the use of BPA, the production of bisphenol S (BPS) and bisphenol AF (BPAF) are increasing. Therefore, an advanced treatment process that is effective for removing both target bisphenols and chlorinated byproducts is required. In this study, we applied UV-LED/chlorine advanced oxidation process which produces various reactive chlorine species (RCS) along with •OH to degrade BPA, BPS, BPAF in water. It is investigated that BPA, BPS, and BPAF were completely degraded within 5 minutes at pH7 and that the degradation of BPA, BPS, BPAF was predominantly contributed by RCSs. ClxBPA, ClxBPS, and ClxBPAF were identified as major transformation products (TPs) by LC-QTOF-MS analysis, and these TPs were effectively removed in 10 minutes. Based on identified TPs, we proposed degradation pathways during the UV-LED/chlorine reaction. |
