In this paper, BiOCl was prepared by microwave-assisted hydrothermal synthesis method using bismuth nitrate pentahydrate, potassium chloride, ethylene glycol and P123 as raw materials. Microwave power, temperature and microwave holding time were changed to determine the conditions of the BiOCl preparation for the best photocatalytic degradation of metronidazole. The optimal synthetic condition of BiOCl was determined to be 600W, 120℃ and 30 min, under which the synthetic product showed the best degradation on metronidazole under simulated sunlight. The prepared materials were characterized by XRD and SEM to investigate crystal structure and surface characteristics of BiOCl. Besides, the effect of reaction conditions such as catalyst dosage, metronidazole initial concentration and pH on the degradation of metronidazole were also investigated. At the condition of catalyst dosage 2.5g/L, metronidazole concentration 5mg/L and pH 3, the degradation efficiency of metronidazole reached to 98.3%. The capture experiment indicated the main active species wereholes (h+) and superoxide radical (·O2-) in the degradation of metronidazole.
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