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

催化作用 化学 X射线光电子能谱 激进的 活性炭 降级(电信) 羟基自由基 氧气 纳米复合材料 核化学 化学工程 有机化学 吸附 计算机科学 电信 工程类
作者
Zhiquan Yang,Ying Li,Xinyi Zhang,Xiandi Cui,Shan He,Heng Liang,An Ding
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:384: 123319-123319 被引量:207
标识
DOI:10.1016/j.cej.2019.123319
摘要

In this study, the sludge activated carbon-based CoFe2O4 (CoFe2O4-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 CoFe2O4-SAC composite, such as XRD, FTIR, SEM and XPS, showed that the composite had more efficient catalytic activity than CoFe2O4. The application potential of SAC derived sewage sludge as the support enhanced the catalytic activation performance of the CoFe2O4. NOR could almost be fully degraded within 60 min at pH = 5–9 in the CoFe2O4-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−, HCO3−, and NO3− were also investigated. After five consecutive cycles, CoFe2O4-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 (SO4−) 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.
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