采用溶剂热法制备了铁酸锰（MnFe₂O₄）中空磁性微球（HM-MnFe₂O₄），利用SEM、TEM、XRD、VSM、XPS、BET/BJH方法对材料进行表观和形貌分析，并将其应用于活化过一硫酸盐（PMS）降解水中的甲氧苄啶（Trimethoprim，TMP），通过高效液相色谱法对降解效率进行评估。结果表明，在pH为9.0、PMS浓度为3.0 mmol/L的条件下，投加0.20 g/L的HM-MnFe₂O₄纳米材料可在120 min内完全降解10.0 mg/L的TMP。同时，考察了阴阳离子对TMP降解过程的影响，Cl^-对TMP的降解有促进作用，HCO₃^-、Cu²⁺和腐殖酸（HA）均具有一定的抑制作用。通过自由基猝灭实验发现降解体系受到·OH、O₂^-·的自由基和¹O₂的非自由基影响。循环实验证明HM-MnFe₂O₄纳米材料具有良好的循环利用性能。

Manganese ferrite-based hollow magnetic microspheres (HM-MnFe₂O₄) are prepared through using the solvothermal method, and their morphology is analyzed by means of SEM, TEM, XRD, VSM, XPS, and BET/BJH.HM-MnFe₂O₄ is applied to activate peroxymonosulfate (PMS) to degrade trimethoprim in water.The degradation efficiency is evaluated via high-performance liquid chromatography.It is found that trimethoprim can be degraded completely within 120 min when pH=9.0, the concentrations of PMS and HM-MnFe₂O₄ is 3.0 mmol·L^-1 and 0.20 g·L^-1, respectively.The degradation of TMP can be promoted by Cl^- while it can be inhibited by HCO₃^-, Cu²⁺ and humic acid.It is found through free radical quenching experiment that the degradation system is affected by free radicals including ·OH and O₂^-· as well as ¹O₂ non-free radical.It is verified through cyclic experiments that HM-MnFe₂O₄ has good recycling performance.

孙彬(1998-),男,硕士生,研究方向为环境监测分析技术,2042226052@qq.com。