Ge Yong-Jian, Cai Xian-Wei, Lin Han, Xu Meng-Yuan, Shen Yi-Ting, Zhou Dan, Qian Meng-Jie, Deng Jing
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China.
Huan Jing Ke Xue. 2017 Dec 8;38(12):5116-5123. doi: 10.13227/j.hjkx.201704232.
The degradation of ciprofloxacin (CIP) in a base activated peroxymonosulfate (PMS) system was investigated. Results showed that a base activated PMS system can efficiently remove CIP. Singlet oxygen ( O) and superoxide anion radical (O·) were confirmed to be the major reactive oxygen species through radical quenching experiments. The NaOH concentration, PMS concentration, reactive temperature, and coexisting anions also affected CIP removal. Both NaOH and PMS concentration presented a dual effect, which was highly concentration dependent. An improvement in reactive temperature accelerated CIP degradation, and the calculated activation energy () was determined to be 5.09 kJ·mol through the fitting of the Arrhenius equation. Different anions had different effects on CIP degradation. No obvious change in CIP concentration was observed when Cl, SO, and NO were introduced. HPO inhibited the degradation, but CO significantly promoted it. Ten oxidation products were identified through UPLC-MS/MS analysis, and the piperazine ring in the molecular structure of CIP was preferentially attacked by reactive oxygen species in the base activated PMS system.
研究了碱活化过一硫酸盐（PMS）体系中 ciprofloxacin（CIP）的降解情况。结果表明，碱活化 PMS 体系能有效去除 CIP。通过自由基猝灭实验证实单线态氧（O）和超氧阴离子自由基（O·）是主要的活性氧物种。NaOH 浓度、PMS 浓度、反应温度和共存阴离子也会影响 CIP 的去除。NaOH 和 PMS 浓度均呈现双重效应，且高度依赖于浓度。反应温度的升高加速了 CIP 的降解，通过阿伦尼乌斯方程拟合确定计算得到的活化能（）为 5.09 kJ·mol。不同阴离子对 CIP 降解有不同影响。引入 Cl、SO 和 NO 时，CIP 浓度无明显变化。HPO 抑制降解，但 CO 显著促进降解。通过 UPLC-MS/MS 分析鉴定出十种氧化产物，在碱活化 PMS 体系中，CIP 分子结构中的哌嗪环优先受到活性氧物种的攻击。
