Abstract：By using natural cuttlebone as the template, cobalt oxide cluster supported on nitrogen-doped carbon (CoO-CN) were synthesized and applied for degradation of norfloxacin (NOR) via peroxymonosulfate (PMS) activation. The results indicate that the NOR can be effectively degraded by CoO-CN via PMS activation over a wide pH range (pH 3.0~11.0) with the NOR removal percentages all greater than 95%. After five recycling tests, the NOR degradation percentages still retained by 91.8% in the CoO-CN/PMS system. These results demonstrated that the CoO-CN possessed excellent catalytic performance and reusability, which is promising for practical applications in wastewater treatment. Quenching experiments and electron paramagnetic resonance (EPR) manifested that the CoO-CN/PMS system involved in two pathways, that are the radical and non-radical pathways, and produced three kinds of reactive oxygen species (ROS), including sulfate radical (SO4·-), hydroxyl radical (·OH) and singlet oxygen (1O2), for the oxidative degradation of NOR. As compared with pure CN, extra Co active sites can be provided by the CoO-CN, thereby significant enhancing the catalytic performance for PMS activation. In addition, the simple synthetic method and low-cost of CoO-CN endowed it with broad application prospect for organic wastewater treatment.
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