Photocatalytic degradation of sulfonamide and fluoroquinolone antibiotics by Fe-N-co-doped biochar/carbon quantum dots p-n heterojunction materials

文献类型： 外文期刊

第一作者： Zhang, Jingru

作者： Zhang, Jingru;Yang, Guangxin;Kong, Cong;Wang, Jun;Zhang, Jingru;Yang, Guangxin;Zhang, Junyu;Kong, Cong;Wang, Jun

作者机构：

关键词： Photocatalytic degradation; Biochar; Carbon quantum dots; Sulfonamide and fluoroquinolone antibiotics; P -n heterojunction

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 370 卷

页码：

收录情况： SCI

摘要： The misuse of sulfonamide and fluoroquinolone antibiotics leads to pollution of the water environment, necessitating the development of cost-effective and efficient degradation methods. This article presents a onestep hydrothermal method (200 degrees C, 8 h) for the preparation of Fe-N-co-doped biochar/carbon quantum dots (Fe/N/BC/CQDs) as a photocatalytic material. The Fe/N/BC/CQDs was employed for the activation of H2O and O2, facilitating the degradation of sulfonamide and fluoroquinolone antibiotics, with superoxide radicals, photogenerated holes, hydroxyl radicals, and singlet oxygen dominated the photodegradation process. Under 1 h dark and 8 h natural light conditions, the degradation efficiency of norfloxacin, sulfathiazole, sulfamethoxazole, sulfamonomethoxine, sulfadoxin, sulfamethazine (10 mg/L) by Fe/N/BC/CQDs ranged from 74.21 % to 89.23 %. The potential degradation pathways of sulfonamide and fluoroquinolone antibiotics were proposed based on ultrahigh-performance liquid chromatography tandem high-resolution mass spectrometry analysis of the intermediates. The Fe-N-doped biochar's hierarchical pore structure enhances synergistic adsorption-catalysis effects, while the incorporated carbon quantum dots (CQDs) broaden solar spectrum utilization, effectively overcoming the high-intensity light dependency common to conventional photocatalysts. Efficient charge separation was achieved through the formation of a p-n heterojunction between Fe-N-co-doped biochar and CQDs. Additionally, the applicability of Fe/N/BC/CQDs in real water systems was confirmed, providing valuable insights for the construction of p-n heterojunction structures to degrade organic pollutants in water.

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