A facile method was used to synthesize amorphous potassium ferricyanide (PF)@ZIF-67 nanocages, a novel metal–organic framework derivative. The structure, composition and morphology of PF@ZIF-67 were analysed by scanning electron microscopy, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy. The results show that PF@ZIF-67 nanoparticles were successfully prepared and its nanostructure has high crystallinity. The prepared materials were employed as heterogeneous persulfate catalysts for the degradation of levofloxacin (LEV). The effects of some key parameters including sodium persulfate (PS) dosage, PF@ZIF-67, initial solution pH and reaction time on LEV degradation were investigated. PF@ZIF-67 showed higher catalytic capacity for LEV degradation compared to ZIF-67, implying the iron-cobalt synergy in the material. Under the optimized conditions of 8.4-mM PS, 0.5 g/L PF@ZIF-67 at an initial solution pH of 7.2, 85.8% of LEV could be removed within 240 min. The quenching experiments suggest that sulfate radicals were the predominant reactive species.

中文翻译：

---

通过无定形铁氰化钾@ZIF-67纳米笼上的过硫酸盐活化增强催化左氧氟沙星降解

采用一种简便的方法合成了无定形铁氰化钾（PF）@ZIF-67纳米笼，这是一种新型金属有机骨架衍生物。通过扫描电子显微镜、透射电子显微镜、X射线衍射和X射线光电子能谱分析了PF@ZIF-67的结构、组成和形貌。结果表明，成功制备了PF@ZIF-67纳米粒子，其纳米结构具有较高的结晶度。所制备的材料用作多相过硫酸盐催化剂，用于降解左氧氟沙星（LEV）。研究了过硫酸钠 (PS) 用量、PF@ZIF-67、初始溶液 pH 值和反应时间等一些关键参数对 LEV 降解的影响。与 ZIF-67 相比，PF@ZIF-67 对 LEV 降解表现出更高的催化能力，这表明该材料具有铁钴协同作用。在8.4 mM PS、0.5 g/L PF@ZIF-67、初始溶液pH 7.2的优化条件下，240分钟内可以去除85.8%的LEV。猝灭实验表明硫酸根是主要的活性物质。