镍铁氧体催化过硫酸氢钾对奥卡西平的降解研究

Catalyzing Peroxymonosulfate by NiFe_2O_4 for Oxcarbazepine Degradation

研究了通过水热合成法制备的镍铁氧体(NiFe_2O_4),催化过硫酸氢钾(PMS)产生自由基,在常温常压下降解奥卡西平(OXC).采用扫描电子显微镜(SEM)、X射线粉末衍射(XRD)及磁滞回线对镍铁氧体催化剂进行了表征;探究了PMS投加量、NiFe_2O_4投加量以及初始pH对OXC降解效率的影响,结果显示提高PMS和NiFe_2O_4的投量以及偏中性的初始pH均有利于OXC的降解.通过投加不同种类的猝灭剂(甲醇和叔丁醇),证实了OH·和SO_4^-·对OXC的降解起着重要作用,且SO_4^-·的作用更显著.此外,进一步的试验发现NiFe_2O_4具有较好的稳定性和重复利用性:经6次重复使用后,NiFe_2O_4对OXC的降解效率仍可以维持在88%左右;并且,PMS/NiFe_2O_4对滤后水和原水中的OXC也能进行高效催化去除.这些试验结果表明PMS/NiFe_2O_4催化氧化体系对OXC等PPCPs的降解具有良好的应用前景.

A novel catalyst,nikel ferrite（NiFe2O4）,was prepared via hydrothermal synthesis method,and successfully used to activate peroxymonosulfate for degradation of oxcarbazepine（OXC）.The catalyst was characterized by scanning electron microscopy（SEM）,X-ray diffractometry（XRD）,and magnetic hysteresis loops.The effects of NiFe2O4 dosage,peroxymonosulfate dosage,and initial pH on the OXC degradation were investigated.The experimental results indicated that high NiFe2O4 and peroxymonosulfate dosages,neutral initial pH enhanced the degradation efficiency.Furthermore,by adding different radical scavengers（TBA and MeOH）,hydroxyl radical（OH·）and sulfate radical（SO4--·）were identified to be responsible for OXC degradation and SO4--·made the predominant contribution.Besides,NiFe2O4 could retain high degradation efficiency around 88%even after being reused for six times.The catalytic oxidation of OXC in filtrate and raw water with PMS/NiFe2O4 system was also effective.All results suggest that oxidation of PPCPs such as OXC using PMS/NiFe2O4 system has a promising application potential.