| Title |
Removal of Sulfamethoxazole using Ozonation or UV Radiation Kinetic Study and Effect of pH |
| Authors |
정연정 ( Yeon Jung Jung ) ; 김완기 ( Wan Gi Kim ) ; 장하영 ( Ha Young Jang ) ; 최양훈 ( Yang Hwun Choi ) ; 오병수 ( Byung Soo Oh ) ; 강준원 ( Joon Wun Kang ) |
| Keywords |
Ozone; pH; Quantum yield; Rate constant; Sulfamethoxazole; UV |
| Abstract |
This study was performed to assess the potential use of ozone or UV radiation for the treatment of water contaminated with sulfamethoxazole (SMX), which is frequently used antibiotic in human and veterinary medicines, especially focusing on the kinetic study and effect of pH. In a study using ozone alone, kinetic study was performed to determine second-order rate constant (kO3,SMX) for the reactions of SMX with ozone, which was found to be 1.9 × 106 M-1s-1 at pH 7. The removal efficiencies of SMX by ozone were decreased with increase of pH due to rapid decomposition of ozone under the condition of various pH (2.5, 5.3, 7, 8, 10). In a UV irradiation study at 254 nm, a kinetic model for direct photolysis of SMX was developed with determination of quantum yield (0.08 mol Einstein-1) and molar extinction coefficient (15,872 M-1cm-1) values under the condition of quantum shielding due to the presence of reaction by-products formed during photolysis. For effect of pH on photolysis of SMX, SMX in the anionic state (S-, pH > 5.6), most prevalent form at environmentally relevant pH values,degraded more slowly than in the neutral state (SH, 1.85 < pH < 5.6) by UV radiation at 254 nm. |