Iron Oxide Activated Persulfate For Removing Antibiotic Pollutants

Persulfate activation technology is a new advanced oxidation technology that has been widely used in wastewater treatment and underground soil remediation.Persulfate has good stability and is convenient for transportation and storage.Moreover,sulfate radical?·SO₄^-?produced by the activation of persulfate has a long half-life,which can be accessible to pollutants.It has sufficient reaction and has a wide applicable pH range,which is more conducive to practical application.Persulfate can be activated through alkali activation,thermal activation,ultraviolet light activation,and transition metal ion activation.Among them,transition metal ion activation saves most energy,but it cannot be recycled.Now metal oxides are often used to activate persulfate.Based on this,this paper focuses on the development of environmentally friendly iron oxide-activated persulfate,and studies the degradation performance of the system for antibiotics.?1?The magnetic iron oxide Fe₃O₄ was prepared by the water bath method,and the antibiotic compound tetracycline hydrochloride was degraded by the iron oxide activated persulfate to degrade the tetracycline hydrochloride by 82.6%.The effects of Na₂S₂O₈concentration,iron oxide addition amount and reaction pH were studied,and the optimal reaction conditions were determined.After finding the best conditions,HCO₃^-,CI^-,Mg²⁺,and Ca²⁺plasmas were added to the reaction system to simulate whether the ions in the water had an effect on the system.By degrading the concentration of different pollutants,it was found that the concentration of the pollutants increased.The degradation efficiency of the system is gradually reduced.The active free radicals in the system are detected with a capture agent such as ethanol,tert-butanol and p-benzoquinone.And use EPR to detect free radicals.?2?Amorphous?-FeOOH was prepared by water bath method,and the antibiotic drug tetracycline was degraded by?-FeOOH activated persulfate.The degradation rate of tetracycline hydrochloride was as high as%,and the mineralization rate was 24.5%.The effects of sulfate concentration and different catalyst concentrations and pH were found to find the optimum conditions to study the effects of substances in water on the system.Under near-neutral conditions,?-FeOOH has a strong adsorption capacity for tetracycline hydrochloride.The active free radicals in the system are determined by the addition of a capture agent and the free radicals are detected by EPR.Determine the reaction mechanism.?3?Preparation of goethite??-FeOOH?by water bath method,degradation of antibiotic drug cephalexin by?-FeOOH activation,study of the influence of various reaction parameters on the catalytic performance of the sample,and find the best degradation conditions.And explored the effect of natural matrix in water on the system,found that HCO₃^-will inhibit degradation.The active species of the system is·SO₄^-.