| In recent years, with the rapid development of society, the high incidence ofdepression, antidepressants are widely used. Tricyclic antidepressants since the1950s hasbeen the clinical application of the main varieties, market monopoly antidepressants for30years. Antidepressant is an important branch of pharmaceuticals and personal careproducts (PPCPs).It has the characteristics of PPCPs such as cumulative cycle, potentiallypersistence.It can directly affect the central nervous system and damage neuroendocrinesignal. Antidepressants causing great threat to regional security environment and thehealth of residents.Many researches has proved antidepressants is widely present in thesoil, water and biological body and water is an important way and carrier ofantidepressants circulating in the environment,therefore, the control and removal ofresidual antidepressants in water environment is of great significance.However the watertreatment and sewage treatment process cannot effectively remove antidepressants, soresearching an effective method for the degradation of antidepressants is particularlyurgent. Ferrate is a safe, non-polluting green strong oxidizing agent of high selectivity andhigh activity.It has a broad application prospects in water treatment.In this paper, typical antidepressants amitriptyline and nortriptyline are selected asresearch subjects, investigating the behavior of ferrate degrading antidepressants,discussing the influence of dosage, pH, light conditions, dosing way on ferrate degradingantidepressants, analysising the kinetics, oxidation products and pathway.The main contents and results of the experimental study are as follows:(1) With theincrease of potassium ferrate dosage, the removal of amitriptyline significantly increased;When ferrate dosing volume is more than200μM, the removal of amitriptyline increasedslowly;The degradation accord with first-order kinetic equation;(2) the degradationefficiency changed with variable pH and follow the order of pH6.07.010.08.09.0, the reaction optimum pH value is9.0.(3) The light condition has a great influence onthe degradation efficiency of ferrate oxidating amitriptyline: Simulated sunlight can notremove amitriptyline from water.UV could degrade amitriptyline directly and reactiing60min can remove75.9%amitriptyline; When UV and Fe (VI) function together, the removal rate of amitriptyline could improve to88.5%,greater than either factorfunctioning alone.(4) Fractionated dosing100μmol/L potassium ferrate, amitriptylineremoval increased from52.6%to58.5%; fractionated dosing400μmol/L potassium ferrate,amitriptyline removal of89.1%improved to94.1%,with an increase of5.0%;It isobviously that the removal rate of fractionated dosing was higher than that of disposabledosing.(5)Analyze the oxidation products and pathway of ferrate degrading amitriptylineby LC-MS detection. Amitriptyline is oxidized to dibenzosuberone (C15H12O) and3-dimethylamino-propionaldehyde. finally.Ferrate degrading nortriptyline research suggests:(1) With the increase of potassiumferrate dosage, the removal of nortriptyline significantly increased; When ferrate dosingvolume is more than150μM, the removal of nortriptyline increased slowly;Thedegradation accord with first-order kinetic equation; nortriptyline is oxidated more easilythan amitriptyline.(2) the degradation efficiency changed with variable pH and follow theorder of pH6.07.010.08.09.0, the reaction optimum pH value is9.0.(3) Theinfluence of light condition on the degradation efficiency of ferrate oxidating nortriptyline:the existence of simulated sunlight has no effect on Fe (VI) degrading nortriptyline;UVcould degrade nortriptyline directly and the removal rate is38.4%; When UV and Fe (VI)function together, the removal rate of nortriptyline could improve to75.9%,greater thaneither factor functioning alone;the UV deradation effect of amitriptyline is better than thatof nortriptyline.(4) Fractionated dosing100μmol/L potassium ferrate, nortriptylineremoval increased from62.7%to68.6%; fractionated dosing300μmol/L potassium ferrate,amitriptyline removal of95.0%improved to98.0%,with an increase of3.0%;It isobviously that the removal rate of fractionated dosing was higher than that of disposabledosing.(5)Analyze the oxidation products and pathway of ferrate degrading amitriptylineby LC-MS detection. Nortriptyline is oxidized to dibenzosuberone (C15H12O) and3-methylamino-propionaldehyde finally.This study shows that the ferrate has a good degradation rate in the antidepressants-containing wastewater treatment, it has practical significance for the antidepressants-containing wastewater treatment... |
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