| In recent years,with the wide application of fluoroquinolone antibiotics represented by Moxifloxacin hydrochloride（MOX）in the prevention and treatment of bacterial infection,antibiotic wastewater has become one of the important sources of pollution in Chinese industry.Among many water treatment technologies,the advanced oxidation of persulfate has become the preferred treatment technology for antibiotic wastewater due to the strong oxidation of sulfuric acid free radical(SO4·-).However,the single activation method has some disadvantages at present.In view of the above problems,in view of the unique advantages of spinel bimetallic sulfide and graphene materials with high catalytic activity and strong electrical conductivity,this study aims to develop a magnetic FeNi2S4/graphene（rGO）supported catalyst with high catalytic activity,strong stability and easy separation and recovery,and introduce electrochemical synergic activation of persulfate for MOX degradation.In this study,FeNi-LDH/GO precursor was prepared using urea as base,and then magnetic Ni Fe2S4/rGO was prepared by vulcanization-pyrolysis two-step method.Taking MOX as removal object and persulfate（PMS）as oxidant,the optimum preparation conditions were determined by investigating the effects of various factors on the performance of the catalyst.And through various characterization,combined with the results of comparison experiment and five-cycle reuse experiment,the catalytic performance of the optimized prepared catalyst was evaluated.On this basis,the optimum process conditions of electrosynergistic catalytic oxidation system were determined by single factor experiment,and the effects of coexistence anions and humic acids on the degradation efficiency of MOX were investigated.In addition,the activation mechanism and the degradation mechanism of the cooperative system were discussed.The experimental conclusions are as follows:Using thioacetamide as sulfur source,the magnetic FeNi2S4/rGO prepared under the conditions of GO concentration of 0.5 mg/m L,metal molar ratio of 2:1,vulcanization temperature of 160 oC,vulcanization time of 8h and calcination time of1.5h showed the best catalytic activity.Its surface area is 17.248 m2/g,which is a kind of mesoporous material.Compared with FeNi2S4,its impedance is smaller and its specific capacitance is larger,so it has higher electron transmission efficiency.Compared with other catalytic materials,the supported catalytic material has higher catalytic activity and stability,and the degradation rate of MOX can still maintain above 88.77%after five times of reuse.When the dosage of PMS is 330 mg/L,the dosage of catalyst is 200 mg/L,the current density is 12.5 m A/cm2,the electrolyte concentration of Na2SO4is 50 m M,the initial concentration of MOX is 20μM,and the pH is 6,The catalytic oxidation system with FeNi2S4/rGO as catalyst showed the best degradation efficiency of MOX.Compared with other common anions Cl-,NO3-and humic acid in wastewater,HCO3-has slightly obvious inhibition on the degradation of MOX,but the overall effect is small and easy to be applied in practice.In this system,SO4·-plays a leading role,and the O-C=O on the surface of the carrier rGO and the Ni3+and Fe2+on the surface of FeNi2S4play a synergistic role in activating the PMS to produce SO4·-and·OH.It was also indirectly proved that the introduction of electrochemistry promoted the recycling of metal ions on the catalyst surface.Finally,the energy consumption of the electrocooperative catalytic oxidation system was evaluated as 0.75（k Wh/m3）.MOX is mineralized into CO2and H2O after decarboxylation,defluorination,piperazine ring-opening and other processes under the action of electrosynergistic catalytic oxidation system. |
