Abstract
In response to the escalating concerns over antibiotics in aquatic environments, the photo-Fenton reaction has been spotlighted as a promising approach to address this issue. Herein, a novel heterogeneous photo-Fenton catalyst (Fe3O4/WPC) with magnetic recyclability was synthesized through a facile two-step process that included in situ growth and subsequent carbonization treatment. This catalyst was utilized to expedite the photocatalytic decomposition of ciprofloxacin (CIP) assisted by H2O2. Characterization results indicated the successful anchoring of MIL-101(Fe)-derived spindle-like Fe3O4 particles in the multi-channeled wood-converted porous carbon (WPC) scaffold. The as-synthesized hybrid photocatalysts, boasting a substantial specific surface area of 414.90 m2·g−1 and an excellent photocurrent density of 0.79 μA·cm−2, demonstrated superior photo-Fenton activity, accomplishing approximately 100% degradation of CIP within 120 min of ultraviolet-light exposure. This can be attributed to the existence of a heterojunction between Fe3O4 and WPC substrate that promotes the migration and enhances the efficient separation of photogenerated electron–hole pairs. Meanwhile, the Fe(III)/Fe(II) redox circulation and mesoporous wood carbon in the catalyst synergistically enhance the utilization of H2O and accelerate the formation of •OH radicals, leading to heightened degradation efficiency of CIP. Experiments utilizing chemical trapping techniques have demonstrated that •OH radicals are instrumental in the CIP degradation process. Furthermore, the study on reusability indicated that the efficiency in removing CIP remained at 89.5% even through five successive cycles, indicating the structural stability and excellent recyclability of Fe3O4/WPC. This research presented a novel pathway for designing magnetically reusable MOFs/wood-derived composites as photo-Fenton catalysts for actual wastewater treatment.
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The date that support the findings of this study are available form the corresponding author upon reasonable request.
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The authors received the financial support provided by the Yunnan Agricultural Joint Special General Project (202301BD070001-243), Yunnan Province Natural Science Key Foundation (202201AS070152), Key Laboratory of State Forestry and Grassland Administration on Highly Efficient Utilization of Forestry Biomass Resources in Southwest China (2022-KF04), Scientific Research Fund Project of the Yunnan Provincial Department of Education (2023J0695), Distinguished Young Scholars in Yunnan Province (202001AV070008), and Special Project of “Top Young Talents” of Yunnan Ten Thousand Talents Plan (51900109).
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Kaiqian Li: conceptualization, investigation, supervision, writing—original draft. Xupeng Zhang: formal analysis, methodology, writing—review and editing. Xueqin Huang: data curation, methodology. Xianghong Li: investigation, formal analysis. Qiaowen Chang: methodology, validation. Jing Wang: software, methodology. Shuduan Deng: visualization, methodology, investigation. Gang Zhu: conceptualization, methodology, supervision, writing—review and editing, project administration.
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Li, K., Zhang, X., Huang, X. et al. Wood-converted porous carbon decorated with MIL-101(Fe) derivatives for promoting photo-Fenton degradation of ciprofloxacin. Environ Sci Pollut Res 31, 23924–23941 (2024). https://doi.org/10.1007/s11356-024-32679-2
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DOI: https://doi.org/10.1007/s11356-024-32679-2