Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2020, Vol. 56 ›› Issue (3): 546-552.DOI: 10.13209/j.0479-8023.2020.026

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Preparation of Magnetic g-C3N4-Fe3O4 Nanocomposites and the Photocatalytic Degradation of Three Quinolones in Aqueous Solution

TAO Huchun†, LIANG Hongfei, ZHANG Lijuan, DING Lingyun, ZHANG Shanfa, ZHU Lili, DENG Liping   

  1. Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055
  • Received:2019-05-10 Revised:2019-05-18 Online:2020-05-20 Published:2020-05-20
  • Contact: TAO Huchun, E-mail: taohc(at)pkusz.edu.cn

磁性g-C3N4-Fe3O4复合纳米材料的制备及其光催化降解水中3种喹诺酮类抗生素的研究

陶虎春†, 梁红飞, 张丽娟, 丁凌云, 张善发, 朱丽丽, 邓丽平   

  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)pkusz.edu.cn
  • 基金资助:
    国家自然科学基金(51679002)、深圳市基础研究项目(JCYJ20180503182122539, JCYJ20160330095549229)和流域生态工程学学科建设资金(深发改[2017]542号)资助

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Abstract:

Magnetic g-C3N4-Fe3O4 nanomaterials were prepared by using melamine and iron salts as raw materials, and the effects of different operating factors on the photocatalytic degradation of three quinolone antibiotics were investigated. The optimal conditions for the photocatalytic reactions were: initial antibiotic concentration of 3.0 mg/L, initial g-C3N4-Fe3O4 dose of 0.60 g/L, at 25℃, and pH=7. Under optimized conditions, the degradation efficiencies of Lomefloxacin, Ofloxacin and Ciprofloxacin were 83.6%, 60.9% and 99.0% after 100 min light irradiation, respectively. XRD and UV-vis analyses show that the graphite-phase g-C3N4 has strong interaction with magnetic Fe3O4, resulting in the formation of more photogenerated electron-hole pairs and enhancing the photocatalytic activity of the composite nanomaterials. After repeated recycling for 5 times, there are more than 90% of magnetic g-C3N4-Fe3O4 nanomaterials recovered, and the photocatalytic efficiency is maintained at higher than 60%.

Key words: photocatalysis, g-C3N4-Fe3O4 nanocomposites, Lomefloxacin (LOM), Ofloxacin (OLF), Ciprofloxacin (CIP)

摘要：

以三聚氰胺和铁盐为原料制备磁性g-C3N4-Fe3O4复合纳米材料, 并探究不同反应条件对其光催化降解3 种喹诺酮类抗生素(洛美沙星LOM、氧氟沙星OLF和环丙沙星CIP)的影响。光催化反应的优化条件如下: 抗生素初始浓度为3.0 mg/L, g-C3N4-Fe3O4复合纳米材料初始剂量为 0.60 g/L, 温度为25℃, pH=7。在优化条件下, 洛美沙星、氧氟沙星和环丙沙星光照100分钟的降解率分别为83.6%, 60.9%和99.0%。XRD 和UV-vis分析表明, 石墨相g-C3N4与 磁性Fe3O4之间存在强烈的相互作用, 导致生成更多光生电子–空穴对, 增强复合纳米材料的光催化活性。重复循环利用5次后, 磁性g-C3N4-Fe3O4复合纳米材料的回收率大于90%, 光催化降解效率保持在60%以上。

关键词: 光催化, g-C3N4-Fe3O4复合纳米材料, 洛美沙星LOM, 氧氟沙星OLF, 环丙沙星CIP

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