Fe-PC-CNT中空纤维膜对磺胺甲噁唑的电芬顿降解研究  

Investigation of sulfamethoxazole electro-Fenton degradation using Fe-PC-CNT hollow fiber membrane

作　　者：乔森[1] 季子轩 QIAO Sen;JI Zixuan(School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学环境学院,辽宁大连116024

出　　处：《安全与环境学报》2024年第9期3637-3646,共10页Journal of Safety and Environment

基　　金：国家自然科学基金项目(22176026)。

摘　　要：研究利用铁-多孔碳-碳纳米管(Ferrum-Porous Carbon-Carbon Nanotube,Fe-PC-CNT)中空纤维膜作为过滤中心和电化学阴极构建电芬顿体系,该体系能够将模拟废水中的溶解氧在膜表面还原成过氧化氢(H_(2)O_(2)),进而在Fe~(2+)的催化下产生羟基自由基(·OH),以达到降解磺胺甲噁唑(Sulfamethoxazole,SMX)的目的。利用场发射扫描电子显微镜(Field Emission Scanning Electron Microscopy,FE-SEM)、X射线光电子能谱(X-ray Photoelectron Spectroscopy,XPS)对电芬顿膜形貌及元素价态进行分析,结果显示膜内部存在微孔结构,膜表面存在铁离子,利于H_(2)O_(2)的产生及活化。通过试验探究,发现在施加电压为-1.0 V(vs.SCE)、pH值为3、SMX初始质量浓度为600μg/L的条件下能够去除96.5%的SMX。根据猝灭试验和电子顺磁共振测试,得知·OH是反应中存在的主要活性物种。此外,Fe-PC-CNT中空纤维膜在4个循环后仍表现出良好的稳定性。研究可为去除水环境中的抗生素提供方案。In this research,an electro-Fenton system was established utilizing a Fe-Porous Carbon-Carbon Nanotube(Fe-PC-CNT)hollow fiber membrane as a filtration center and an electrochemical cathode for treating Sulfamethoxazole(SMX)in wastewater.The Fe-PC-CNT hollow fiber membrane comprises ZIF-8-derived porous carbon,carbon nanotubes,and Fe^(2+).Notably,the Fe-PC-CNT hollow fiber membrane can reduce the dissolved oxygen in simulated wastewater to hydrogen peroxide(H_(2)O_(2))on its surface,and the resulting H_(2)O_(2)can oxidize SMX by generating hydroxyl radicals(·OH)with the catalytic effect of Fe^(2+).The morphology and elemental valence states of the electro-Fenton membrane were examined using Field Emission Scanning Electron Microscopy(FE-SEM)and X-ray Photoelectron Spectroscopy(XPS).The results reveal that the iron ions present on the membrane surface facilitate the activation of H 2O 2,while the presence of a microporous structure within the membrane promotes the synthesis of H_(2)O_(2).It was observed that at a voltage of-1.0 V(vs.SCE),pH of 3,and an initial concentration of 600μg/L,the removal rate of SMX reached 96.5%,with a TOC mineralization of 55.1%.Kinetic analysis indicates that the oxidative degradation reaction of SMX adheres to first-order reaction kinetics under optimal reaction conditions.According to the quenching experiments and Electron Paramagnetic Resonance(EPR)tests,it has been established that·OH is the primary active species involved in the reaction.This is evidenced by the decrease in degradation efficiency from 95.4%to 22.8%following the quenching of·OH.The EPR results exhibit characteristic peaks of 1:2:2:1,consistent with the peak of·OH.Pure filtration experiments indicate that adsorption has minimal influence on the degradation of SMX.Furthermore,the Fe-PC-CNT hollow fiber membrane demonstrates ease of recyclability,retaining a degradation efficiency of 89.3%after four cycles.Additionally,the internal structure of the membrane remains stable.Notably,the energy consumption of the syst

关 键 词：环境工程学 电芬顿 羟基自由基 膜过滤 磺胺甲噁唑 

分 类 号：X522[环境科学与工程—环境工程]