摘要
针对左氧氟沙星(LEV)在水环境中引发的抗生素污染问题,本研究通过低温共沉淀结合加压过滤技术,将锆基铁酸锰纳米颗粒(ZrO_(2)/MnFe_(2)O_(4))负载于商用陶瓷膜(CM),构建了高效活化过硫酸盐(PDS)的非均相类芬顿催化膜体系。实验表明,在铁锆摩尔比为10、初始pH为8.5、PDS浓度为1 mmol/L及催化剂负载量35 mg条件下,80 min内LEV去除率达91.34%(初始浓度20 mg/L)。自由基淬灭实验与自由基捕获实验证实,硫酸根自由基主导降解过程,协同羟基自由基与超氧自由基实现LEV高效矿化。金属离子浸出实验表明,负载工艺显著降低了铁锰离子浸出(浸出浓度<0.01 mg/L)。共存阴离子及天然有机物存在下的LEV降解实验表明,共存阴离子及EDTA(乙二胺四乙酸)对体系抑制作用有限(最终去除率>75%),而低浓度的腐殖酸(HA)可轻微提升自由基产率。锆基铁酸锰催化膜在4次循环后仍保持75%以上的LEV去除率,展现出优异的循环稳定性。最后结合XPS表征结果给出了催化机理。
To address antibiotic pollution caused by LEV in water environments,this study fabricated an efficient heterogeneous Fenton-like catalytic membrane system capable of activating PDS by immobilizing zirconium-based manganese ferrite nanoparticles onto CM via low-temperature coprecipitation combined with pressure filtration.Experimental results demonstrated that under optimal conditions(Fe/Zr molar ratio of 10,initial pH of 8.5,PDS concentration of 1 mmol/L,and catalyst loading of 35 mg),the LEV removal rate reached 91.34%within 80 minutes for an initial concentration of 20 mg/L.Radical quenching and trapping experiments confirmed that sulfate radicals dominated the degradation process,synergizing with hydroxyl and superoxide radicals to achieve efficient LEV mineralization.Metal leaching tests indicated that the immobilization process significantly reduced iron and manganese leaching(<0.01 mg/L).Degradation experiments in the presence of coexisting anions and natural organic matter revealed limited inhibitory effects(final removal>75%),while low concentrations of humic acid(HA)slightly enhanced radical generation.The zirconium-based manganese ferrite catalytic membrane retained over 75%LEV removal after four cycles,demonstrating excellent recycling stability.Finally,the catalytic mechanism was proposed based on XPS characterization results.
作者
聂发辉
崔培涛
王励卿
杨昱清
刘占孟
NIE Fahui;CUI Peitao;WANG Liqing;YANG Yuqing;LIU Zhanmeng(School of Civil Engineering and Architecture,East China Jiaotong University,330013;School of Civil and Architectural Engineering,Nanchang University of Engineering,330099:Nanchang,China)
出处
《水处理技术》
北大核心
2026年第3期39-45,共7页
Technology of Water Treatment
基金
国家自然科学基金项目(52260005)
江西省自然科学基金(20242BAB25323)。
关键词
锆基铁酸锰
催化膜
过硫酸盐
LEV
类芬顿工艺
Zirconium-based manganese ferrate
catalytic membrane
PDS
LEV
Fenton like process
