Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2021, Vol. 57 ›› Issue (3): 587-594.DOI: 10.13209/j.0479-8023.2021.037

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Photocatalytic Degradation of Ciprofloxacin by Magnetic CoFe2O4/g-C3N4 Nanocomposites

TAO Huchun, DENG Liping, ZHANG Lijuan, DING Lingyun   

  1. Shenzhen Key Laboratory for Heavy Metal Remediation and Reclamation, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055
  • Received:2020-04-23 Revised:2020-05-21 Online:2021-05-20 Published:2021-05-20
  • Contact: TAO Huchun, E-mail: taohc(at)


陶虎春, 邓丽平, 张丽娟, 丁凌云   

  1. 北京大学深圳研究生院环境与能源学院, 深圳市重金属污染控制与资源化重点实验室, 深圳 518055
  • 通讯作者: 陶虎春, E-mail: taohc(at)
  • 基金资助:
    国家自然科学基金(51679002, 51809004)、深圳市基础研究项目(JCYJ20180503182122539)和流域生态工程学学科建设资金(深发改〔2017〕542 号)资助


Magnetic CoFe2O4/g-C3N4 nanocomposites were synthesized and its surface morphology, element and chemical composition, specific surface area, functional group characteristics and crystal structure were characterized. Targeting at quinolone antibiotics of ciprofloxacin (CIP), the photo-catalytic degradation of CIP by CoFe2O4/g-C3N4 nanocomposites was investigated at different calcination temperature (300oC, 400oC and 500oC) and composite ratio (CoFe2O4:g-C3N4=10%, 20% and 40%, w/w). Under optimal synthesis and operating conditions, a maximum degradation efficiency of 75.1 ± 0.1% was achieved for 0.9 g/L CoFe2O4/g-C3N4 with 10 mg/L CIP (pH=6.6) within 120 min. With an external magnetic field, the CoFe2O4/g-C3N4 nanocomposites were easily and rapidly recycled, remaining >90% of the initial efficacy after 5 cycles and showing a considerable stability. Fluorescence spectra revealed a significant decrease in electron-hole recombination rates under light radiation, which contributed greatly to the increase of photo-degradation efficacy of CIP by CoFe2O4/g-C3Nnanocomposites.

Key words: photocatalysis, magnetic separation, CoFe2O4/g-C3N4 nanocomposites, ciprofloxacin


制备一种可回收的磁性复合纳米光催化材料CoFe2O4/g-C3N4, 并对其表面形貌、元素和化学组成、比表面积、官能团特征和晶体结构进行表征与分析。以环丙沙星(CIP)为代表性污染物, 在不同温度(300oC, 400oC和500oC)和复合比例(CoFe2O4:g-C3N4 = 10%, 20%和40%, w/w)条件下, 考察磁性CoFe2O4/g-C3N4复合纳米材料的光催化降解能力。结果表明, 在优化的制备条件下, 投加0.9 g/L CoFe2O4/g-C3N4时, 对10 mg/L CIP (pH=6.6)的120分钟光降解率可以达到75.1% ± 0.1%。在外加磁场作用下, 该纳米材料可实现快速分离回收。经过5次循环回收利用后, 光催化能力仍能达到最初效率的 90%以上, 表现出较好的稳定性。荧光发射光谱图显示, CoFe2O4/g-C3N4复合纳米材料中的电子?空穴复合速率显著降低, 可以提高其对CIP的光催化效果。

关键词: 光催化, 磁分离, CoFe2O4/g-C3N4复合纳米材料, 环丙沙星