摘要
针对抗生素大量使用对水生态安全的潜在威胁,制备了一种磁性生物炭-蒙脱石复合材料,用于去除水体中的诺氟沙星(Norfloxacin, NOR)。通过静态吸附试验研究了投加量对NOR去除率的影响,并结合微观表征分析了其去除机制。进一步采用臭氧预氧化-机械搅拌-斜板沉淀组合试验装置,优化了连续运行条件下的工艺参数。结果表明,投加量为1 g/L、pH=7时,磁性生物炭-蒙脱石复合材料对水中NOR的去除率达到92.1%;在优化工艺参数下,NOR和浊度的去除率分别为88.69%和81.55%。研究为处理含NOR废水提供了有效的工艺方案,具有较好的应用前景。
This study developed a novel adsorbent tailored for a combined ozone pre-oxidation-adsorption coagulation process.The aim is to efficiently remove norfloxacin(NOR)from water that typically exhibits low turbidity and high concentrations of NOR,as commonly found in natural environments.Magnetic adsorbents Magnetic Biochar-Montmorillonite(MBC MMT)were synthesized using corn stalks,montmorillonite,and pyrite.Subsequently,adsorption experiments were conducted to evaluate the effect of adsorbent dosage on the removal efficiency of NOR.MBC MMT was characterized using SEM/EDS,FTIR,and XRD analyses.The removal mechanism of NOR was investigated by comparing the FTIR and XRD spectra before and after the reaction.This analysis provided insights into the interactions between NOR and the adsorbent,revealing changes in the chemical structure during the adsorption process.The mechanism underlying the removal of NOR was then investigated.Based on the results of the static experiments,the optimal dosage was determined,and subsequent continuous experiments were performed to assess its effectiveness.Polyaluminum Chloride(PAC)was used as the coagulant,and the optimal reaction time for individual adsorption under continuous operation conditions was determined using a combined system of ozone pre-oxidation,mechanical stirring,and inclined plate sedimentation.The results showed that the removal efficiency of NOR and turbidity was maximized when the reaction time was 60 minutes.Additionally,the optimal coagulant dosage range was determined using a six-joint stirrer,and the effect of the addition order of the adsorbent and coagulant was investigated.The experimental results revealed that the highest removal efficiency of NOR and turbidity was achieved when the adsorbent and coagulant were added simultaneously.The optimal dosage of PAC was determined through continuous experiments,building on the findings from the previous static tests.Therefore,under the optimal process parameters,this method achieved a high removal efficiency for norfloxacin(NOR).These findings provide valuable insights into the potential of combined water treatment processes for effectively treating antibiotic-contaminated turbid water.
作者
周新华
陆林
李喜林
孟凡康
丁自强
李志浩
张建新
张婷
ZHOU Xinhua;LU Lin;LI Xilin;MENG Fankang;DING Ziqiang;LI Zhihao;ZHANG Jianxin;ZHANG Ting(College of Civil Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China)
出处
《安全与环境学报》
北大核心
2025年第6期2351-2360,共10页
Journal of Safety and Environment
基金
2022年度粤港澳污染物暴露与健康联合实验室开放基金项目(GHMJLCEH-02)。
关键词
环境工程学
磁性生物炭
臭氧预氧化
诺氟沙星
去除机理
environmental engineering
magnetic biochar
ozone pre-oxidation
norfloxacin
adsorption mechanism
