摘要
In this study, the single-atom sized Ni-N 4 was incorporated into zeolite imidazole framework (ZIF-67) resulting in (Ni-CN@ZIF-67), to activate peroxymonosulfate (PMS) toward degradation of levofloxacin (LVF) in water. The findings revealed that an optimal ratio of Ni-CN to ZIF-67 at 0.5:1 achieved the highest degradation efficiency of LVF, reaching up to 97.6 %, with a corresponding rate constant of 0.652 min −1 within a 10-minute reaction period, compared to single catalysts. Reactive oxygen species (ROS) such as O 2 ●- , ● OH, SO 4 ●- , 1 O 2 , and high-valent metal oxo species were identified in the 0.5:1 Ni-CN@ZIF-67/PMS system, with 1 O 2 playing a crucial role in enhancing LVF degradation. The pathways of LVF degradation were examined based on LC-MS and DFT results, revealing two plausible degradation processes. The toxicity of intermediates was evaluated using TEST analysis, and algal growth studies indicated that the treated LVF solution exhibited reduced toxicity compared to the original LVF. Furthermore, comprehensive evaluations were conducted on the stability, practicability, mechanisms, and mineralization of the 0.5:1 Ni-CN@ZIF-67/PMS system.