聚酰亚胺共价有机框架负载纳米零价铁活化过硫酸盐降解苯酚

Persulfate activated by polyimide covalent organic framework supported nano zero valent iron to degrade phenol wastewater

采用液相还原法制备nZVI@PI-COF催化剂,用于活化过硫酸氢盐(PMS),构建过渡金属非均相活化体系,并应用于苯酚废水的处理,探讨了最佳使用条件,如PMS浓度、催化剂用量、pH、温度等因素对苯酚降解效果的影响。结果表明,nZVI@PI-COF催化剂具有良好稳定性,4次重复使用后降解效率仍能达到85%以上。在酸性条件下(pH=5)、n(苯酚):n(PMS)=1∶10、nZVI@PI-COF用量为1 g·L^(-1)时,反应30 min,降解效率最好。

The heterogeneous nano-scale catalyst nZVI@PI-COF was prepared by liquid phase reduction method,which was used to active PMS,to construct heterogeneous activation system of transition metals,and to treat phenol wastewater.The effects of concentration of persulfate,dosage of catalyst,pH value and temperature on the degradation were studied.The results showed that nZVI@PI-COF had good stability and the degradation efficiency was over 85%after 4 times of reuse.Under acidic conditions(pH=5),n(phenol)∶n(PMS)=1∶10,nZVI@PI-COF dose of 1 g·L^(-1),the best degradation efficiency was obtained in 30 minutes.