生态环境学报2024，Vol.33Issue(5)：757-770,14.DOI:10.16258/j.cnki.1674-5906.2024.05.009
碳球负载纳米零价铁活化过硫酸盐降解水中恩诺沙星的性能研究
Study on the Performance of Carbon Sphere-Supported Nano Zero-Valent Iron Activated Persulfate for Degradation of Enrofloxacin in Water
摘要
Abstract
Enrofloxacin(ENR)belongs to the fluoroquinolone class of antibiotics,characterized by strong stability,difficult degradation,and easy accumulation.It is commonly used in aquaculture and livestock farming.Although its overall concentration in the environment is low,long-term exposure to low doses may pose significant risks to human health and the ecological environment.The removal of ENR from water is achieved by utilizing carbon spheres(CS)loaded with nano zero-valent iron(nZVI)to activate persulfate(PS).Carbon spheres loaded with nano zero-valent iron(Fe@C)were prepared using a two-step carbon thermal reduction method.Single-factor experiments were conducted to investigate the effects of Fe@C dosage,PS concentration,initial ENR concentration and pH on ENR degradation.The reaction mechanism and degradation pathway of ENR by Fe@C activated PS were speculated through the analysis of free radicals and degradation products.The results indicated that the degradation of ENR followed a pseudo-first-order kinetics.Under the conditions of 25℃,Fe@C dosage of 0.3 g∙L-1,PS concentration of 1 mmol∙L-1,initial ENR mass concentration of 10 mg∙L-1,and pH of 3,the highest ENR degradation rate reached 98.6%.The degradation rate of ENR decreased with increasing concentrations of humic acid(HA),ammonia nitrogen(NH3-N),and bicarbonate ions(HCO3-).The chloride ions(Cl-)had a slight promoting effect on the degradation of ENR at low concentrations and an inhibitory effect at high concentrations.Free radical quenching experiments indicated that SO4-∙ was the main free radical involved in ENR degradation.Based on the degradation products of ENR,it was speculated that the cleavage of the piperazine ring,decomposition of the quinolone ring,and defluorination were the main degradation pathways of ENR.The Fe@C activated persulfate advanced oxidation process can serve as an efficient technology for removing ENR from water.关键词
恩诺沙星/碳球负载纳米零价铁/过硫酸盐/降解途径/活化/降解动力学Key words
enrofloxacin(ENR)/carbon sphere-supported nano zero-valent iron/persulfate/degradation pathways/activation/degradation kinetics分类
资源环境引用本文复制引用
赵乐依,朱雪强,刘健,路平..碳球负载纳米零价铁活化过硫酸盐降解水中恩诺沙星的性能研究[J].生态环境学报,2024,33(5):757-770,14.基金项目
国家重点研发计划项目(2020YFC1806502) （2020YFC1806502）
徐州市创新引领示范专项项目(KC23382) （KC23382）
