MIL-88B(Fe/Co)-NH_(2)高效活化过一硫酸盐降解左氧氟沙星

MIL-88B(Fe/Co)-NH_(2)efficiently activating peroxymonosulfate for degrading levofloxacin

以Fe和Co为金属活性中心、2-氨基对苯二甲酸为有机配体,通过溶剂热法制备了Fe、Co双金属基金属有机骨架材料(MIL-88B(Fe/Co)-NH_(2)),并将其用于活化过一硫酸盐(PMS)降解左氧氟沙星(LEV)。实验结果表明:受益于内部Fe/Co间的协同作用,MIL-88B(Fe/Co)-NH_(2)表现出优异的催化性能;在较宽的pH范围内(5.0~9.0),MIL-88B(Fe/Co)-NH_(2)均能高效活化PMS降解LEV;在催化剂加入量40 mg/L、PMS加入量0.3 g/L、溶液初始pH 7.0的条件下反应60 min,LEV去除率可达97.4%;该催化剂具有优良的可重复使用性能,经5次循环使用后LEV去除率仅下降了12.1个百分点;阴离子(Cl^(-)、H_(2)PO_(4)^(-)和HCO_(3)^(-))及腐殖酸的存在对LEV的降解有一定影响;在LEV降解过程中起主要作用的活性氧物种为SO_(4)^(-)·和·OH。

Fe/Co bimetallic metal-organic framework(MOF)(MIL-88B(Fe/Co)-NH_(2))was prepared by solvothermal method using Fe and Co as metal active centers,2-amino-terephthalic acid as organic ligand and it was used to activate peroxymonosulfate(PMS)to degrade levofloxacin(LEV).The results show that MIL-88B(Fe/Co)-NH_(2)has excellent catalytic activity due to the synergistic effect between internal Fe and Co.In a wide pH range(5.0-9.0),MIL-88B(Fe/Co)-NH_(2)can effectively activate PMS to degrade LEV.Under the conditions of adding 40 mg/L of catalyst,0.3 g/L of PMS and initial solution pH of 7.0,the LEV removal rate can reach 97.4%after a reaction of 60 min.The catalyst has excellent reusability,and the LEV removal rate only decreases by 12.1%after 5 cycles of use.The presence of anions(Cl^(-),H_(2)PO_(4)^(-),HCO_(3)^(-))and humic acid has a certain effect on the degradation of LEV.SO_(4)^(-)·and·OH are reactive oxygen species(ROS)playing a major role in LEV degradation.