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Sludge activated carbon-based CoFe2O4-SAC nanocomposites used as heterogeneous catalysts for degrading antibiotic norfloxacin through activating peroxymonosulfate

Zhiquan Yang,Ying Li,Xinyi Zhang,Xiandi Cui,Shan He,Heng Liang,An Ding

In this study, the sludge activated carbon-based CoFe 2 O 4 (CoFe 2 O 4 -SAC) nanocomposites were prepared by a simple hydrothermal method, which were subsequently applied in degrading the antibiotic norfloxacin (NOR) through heterogeneously activating peroxymonosulfate (PMS). Due to its porous structure and more reactive oxygen species (ROS), various characterizations of the CoFe 2 O 4 -SAC composite, such as XRD, FTIR, SEM and XPS, showed that the composite had more efficient catalytic activity than CoFe 2 O 4 . The application potential of SAC derived sewage sludge as the support enhanced the catalytic activation performance of the CoFe 2 O 4 . NOR could almost be fully degraded within 60 min at pH = 5–9 in the CoFe 2 O 4 -SAC/PMS system. The degradation efficiency of NOR was impeded by the strong acidic or alkaline environment. The influences of coexisting anions on the catalytic reaction, such as Cl − , HCO 3 − , and NO 3 − were also investigated. After five consecutive cycles, CoFe 2 O 4 -SAC could still maintain its good catalytic efficiency, with the NOR removal rate of >90%. Additionally, the reaction mechanism was also examined on the basis of radical quenching study and XPS results. Our findings suggested that, sulfate (SO 4 − ) and hydroxyl ( OH) radicals had facilitated the degradation of NOR. The oxygen groups linked to the surface of composited were the primary reactive oxygen species, which developed the oxidation degradation of NOR.