紫外光强化石墨烯负载四氧化三铁活化过硫酸盐降解四环素OA

Objective:To address the aquaculture wastewater pollution caused by tetracycline ﹙TC)antibiotics,a new efficient graphene supported catalyst was prepared.Method:A composite of Fe3O4 loaded on graphene oxide ﹙Fe3O4/GO)was synthesized and used to activate persulfate ﹙PDS)for tetracycline degradation under ultraviolet ﹙UV)irradiation.The degradation of tetracy-cline was investigated under different operating conditions such as the loading capacity of Fe3O4,initial pH,persulfate dosage,and catalyst dosage.Result:Compared to the GO/PDS system,the removal rate of tetracycline in the Fe3O4-10/GO/PDS system in-creased from 59.21%to 79.95%,indicating that the addition of Fe3O4 enhanced the activation performance of the composite material for PDS.When the mass ratio of Fe3O4 was 10%in the composite material Fe3O4/GO,the catalytic effect was optimal,with a tetracy-cline degradation rate of 99.15%.Under experimental conditions,the TC removal rate and degradation rate gradually increased with the increase of persulfate dosage and catalyst dosage,while they decreased with the increase of initial pH.The free radical quench-ing experiments showed that the main active species in the UV/Fe3O4-10/GO/PDS system were SO4,•OH and•O-2.The repeated ex-•-periments revealed that after three cycles of usage,the TC degradation rate still reached 98.83%,indicating that the catalytic perfor-mance of Fe3O4-10/GO was relatively stable.Conclusion:Fe3O4-10/GO has a strong ability to activate persulfate.With the assis-tance of UV,the advanced oxidation technology based on Fe3O4-10/GO-activated persulfate provided a theoretical basis and tech-nical support for the treatment of antibiotic wastewater.