金属有机框架化合物衍生Mn_(2)O_(3)催化过一硫酸盐降解左氧氟沙星

The degradation of levofloxacin by peroxymonosulfate catalyzed by metal organic frameworks derived Mn_(2)O_(3)

采用高温煅烧方法制备得到了金属有机框架化合物衍生Mn_(2)O_(3),并将其用于催化过一硫酸盐(PMS)降解左氧氟沙星(Levo)。在Levo初始质量浓度为1 mg/L、Mn_(2)O_(3)催化剂投加量为0.04 g/L、PMS投加量为0.15 mmol/L、初始pH为6.7的反应条件下,Mn_(2)O_(3)催化PMS反应体系可以快速降解Levo,伪一级动力学常数为0.0337 min^(-1)。无机阴离子和腐殖酸对反应体系的影响不大,Cl-甚至可促进Levo的降解,pH适用范围也较宽(3.0~9.0)。Mn_(2)O_(3)催化PMS降解Levo过程中电子介导机理起着重要作用,同时还存在单线态氧(^(1)O_(2))的贡献,均属于非自由基路径。

Metal organic frameworks derived Mn_(2)O_(3)was prepared by high-temperature calcination method and used to catalyze peroxymonosulfate(PMS)to degrade levofloxacin(Levo).Under the initial Levo mass concentration of 1 mg/L,the catalyst dosage of 0.04 g/L,the PMS dosage of 0.15 mmol/L and the initial pH of 6.7,Levo was quickly degraded in the PMS system catalyzed by Mn_(2)O_(3)with a pseudo-first-order dynamic constant of 0.0337 min^(-1).Inorganic anions and humic acid had little effect on the system.Even more,the presence of Cl-promoted the degradation of Levo.The appropriate pH range was wide(3.0-9.0).The dominant mechanism during the degradation of Levo in the PMS system catalyzed by Mn_(2)O_(3)was a nonradical process,which mainly consisted of electron-mediated mechanism,as well as^(1)O_(2)contribution.