镍铁氧体催化过硫酸氢钾对奥卡西平的降解研究
发布时间：2018-08-03 14:15
【摘要】：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.
[Abstract]:Nickel ferrite (NiFe_2O_4) prepared by hydrothermal synthesis has been prepared to catalyze the production of free radicals by potassium persulfate (PMS) and degrade oxacepine (OXC). At room temperature and atmospheric pressure. The nickel ferrite catalyst was characterized by scanning electron microscope (SEM) X-ray powder diffraction (XRD) and hysteresis loop, and the effects of the dosage of PMS and the initial pH on the degradation efficiency of OXC were investigated. The results showed that increasing the dosage of PMS and NiFe_2O_4 and the neutral initial pH were beneficial to the degradation of OXC. By adding different kinds of quenching agents (methanol and tert-butanol), it is proved that OH and so _ 4- play an important role in the degradation of OXC, and so _ 4- plays a more important role in the degradation of OXC. In addition, further experiments showed that NiFe_2O_4 has good stability and reuse: after six times of repeated use, the degradation efficiency of OXC can still be maintained at about 88% by NiFe2O4, and the OXC in filtered water and raw water can also be effectively removed by PMS/ NiFeS2O4. These results show that PMS/NiFe_2O_4 catalytic oxidation system has a good application prospect for the degradation of PPCPs such as OXC.
【作者单位】： 湖南大学土木工程学院;湖南大学建筑安全与节能教育部重点实验室;
【基金】：“十二五”国家科技支撑计划资助项目(2012BAJ24B03)
【分类号】：X52;X703
本文编号：2162002
[Abstract]:Nickel ferrite (NiFe_2O_4) prepared by hydrothermal synthesis has been prepared to catalyze the production of free radicals by potassium persulfate (PMS) and degrade oxacepine (OXC). At room temperature and atmospheric pressure. The nickel ferrite catalyst was characterized by scanning electron microscope (SEM) X-ray powder diffraction (XRD) and hysteresis loop, and the effects of the dosage of PMS and the initial pH on the degradation efficiency of OXC were investigated. The results showed that increasing the dosage of PMS and NiFe_2O_4 and the neutral initial pH were beneficial to the degradation of OXC. By adding different kinds of quenching agents (methanol and tert-butanol), it is proved that OH and so _ 4- play an important role in the degradation of OXC, and so _ 4- plays a more important role in the degradation of OXC. In addition, further experiments showed that NiFe_2O_4 has good stability and reuse: after six times of repeated use, the degradation efficiency of OXC can still be maintained at about 88% by NiFe2O4, and the OXC in filtered water and raw water can also be effectively removed by PMS/ NiFeS2O4. These results show that PMS/NiFe_2O_4 catalytic oxidation system has a good application prospect for the degradation of PPCPs such as OXC.
【作者单位】： 湖南大学土木工程学院;湖南大学建筑安全与节能教育部重点实验室;
【基金】：“十二五”国家科技支撑计划资助项目(2012BAJ24B03)
【分类号】：X52;X703
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，本文编号：2162002
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