甲酸刻蚀缺陷MOFs电芬顿高效降解磺胺甲恶唑

Efficient degradation of SMX by electro-Fenton with Formic acid etching defective MOFs

采用甲酸刻蚀MIL-88B(Fe)制备了一系列缺陷MOFs并用于催化降解水中磺胺甲恶唑(SMX)为代表的抗生素污染物,通过SEM、XPS、XRD分析手段对材料的形貌和结构进行了表征和分析,考察了pH、电流、SMX初始浓度等因素对SMX去除的影响,探究了SMX催化降解反应的动力学特性以及缺陷MOFs材料的可循环利用性和稳定性,探究了SMX催化降解反应的电流利用效率与能耗,通过自由基淬灭实验推测了SMX催化降解反应发生机理。结果证明,缺陷MOFs材料催化降解SMX性能优于未经刻蚀的MIL-88B(Fe),对于10 mg·L^(-1)SMX,在电流为40 mA、电压为3.5 V、持续通氧气、搅拌的条件下,反应120 min后,5 mmol甲酸刻蚀制得的5A-MIL-88(Fe)对SMX的去除率可达98.72%。以5A-MIL-88(Fe)作为催化剂,协同电芬顿(Fenton)反应构建的处理体系为水中抗生素污染物高效去除提供参考。

A series of defective MOFs were prepared for Sulfamethoxazole(SMX)catalytic degradation by etching MIL-88B(Fe)with formic acid.The catalyst materials were characterized by SEM,XPS and XRD.The effects of pH,electric current,SMX initial concentration on the catalytic degradation efficiency of SMX were investigated,as well as the kinetic characteristics of SMX catalytic degradation reaction and recycling and stability analysis of defective MOFs.In addition,the current utilization efficiency and energy consumption of SMX catalytic degradation reaction were investigated.Free radical scavenger(EDTA-2Na,IPA,BQ)were used to expose the mechanism of SMX catalytic degradation reaction.The results of SMX degradation experiments prove that the performances of defective MOFs are superior to MIL-88B(Fe)without etching.Under the conditions of 40 mA current,3.5 V voltage,continuous oxygen and agitation,the degradation efficiency of10 mg·L^(-1)SMX could reach 98.72%after 120 min,with the catalytic action of 5A-MIL-88(Fe)etched by 5 mmol formic acid.The treatment system constructed with 5A-MIL-88(Fe)as catalyst and electro-Fenton oxidation reaction as core provides a new idea for the efficient removal of antibiotic contaminants in waste water.