Efficient Degradation Of Imipramine By Iron Oxychloride-Activated Peroxymonosulfate Xidation

Imipramine is a typical tricyclic antidepressant,mainly for the treatment of depression.In recent years,antidepressants have been widely detected in natural water.Antidepressants present in the environment can destroy the physiological systems of humans and animals and seriously threaten human health.In the treatment of antidepressants,the Fenton reaction has a good effect on antidepressants.However,the traditional Fenton reaction has only a good removal effect under acidic conditions,which greatly limits the production of Fenton reaction system.Therefore,it is very important to study the Fenton system with good response at near neutral pH.FeOCl catalyst which can effectively activate PMS under near neutral pH was prepared by chemical vapor migration method.The method was used to characterize the degradation of imipramine by activating monopersulfate,and the reaction mechanism was discussed by combining the characterization results.In this paper,the prepared FeOCl catalysts were characterized by X-ray photoelectron spectroscopy,X-ray fluorescence probe,X-ray diffractometer,Fourier transform infrared spectroscopy,nitrogen isothermal desorption,zeta potentiometer and synchronous analyzer.The The results show that Fe,O,Cl and C are mainly present in the preparation materials,and the crystal structure of the material is consistent with the standard FeOCl,and there are obvious Fe-O bond characteristic peaks in the material.In addition,the specific surface area of the preparation material is 1.21㎡/g,the isoelectric point of the material is 6.3,and the weight loss of FeOCl is in the range of 415-490℃.During the reaction,the Fe_III→Fe_Ⅱprocess exists in the material,and the precipitation of iron and chlorine is also present.Secondly,In this paper,PMS was activated by the newly prepared FeOCl catalyst to degrade imipramine.The experimental results,influencing factors（dosage,pH,light,temperature,anion）,reaction mechanism,material reuse and actual application prospects were studied.The results showed that the preparation of the material could activate PMS effectively,and the higher the dosage of PMS and FeOCl,the higher the degradation rate of the substrate.With the progress of the reaction,the pH value of the system gradually decreased.When the pH increased from 4 to 8,the degradation effect of imipramine gradually increased and the degradation rate of imipramine was not significantly affected by simulated sunlight.The higher the temperature,the faster the reaction rate was.Chloride ion and bicarbonate ion promoted the reaction.The The active substances in the degradation process of imipramine are SO₄^?–,HO·and HOCl.Among them,SO₄^?–is the main active substance in the reaction system.The degradation of imipramine in this system is the result of homogeneous reaction and heterogeneous reaction.The main reaction is the heterogeneous reaction of solid-liquid interface.The PMS was still activated after four times of the preparation of the material,but the degradation rate of the substrate was reduced.In the background of chlorine-free tap water,increasing the dosage of PMS can significantly improve the degradation effect on the target pollutants.In addition,the degradation of the system on seven other pollutants was also investigated.The results showed that the system had obvious removal effect on these organic pollutants.The study of this paper provides a class-Fenton reaction system which can efficiently activate PMS degraded organic pollutants under near neutral conditions,which is of great significance for practical application.