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Chem. J. Chinese Universities

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Highly Electroactive and Permeable Janus Filter Membranes by Direct MOF Functionalization of PLA Nanofibers

ZHANG Long1, MA Liang1, XU Chao2, WU Yang2, GAO Na2, WANG Shao-Zhen3, LI Xinyu3, WANG Cunmin3, XU Huan2, ZHANG Shenghui2   

  1. 1. Hubei Key Laboratory of Automotive Power Train and Electronic Control, School of Automobile Engineering, Hubei University of Automotive Technology 2. School of Materials Science and Physics 3. School of Safety Engineering, China University of Mining and Technology
  • Received:2025-07-31 Revised:2025-09-06 Online First:2025-09-16 Published:2025-09-16
  • Contact: ZHANG Shenghui E-mail:zhangshenghui@cumt.edu.cn
  • Supported by:
    Supported by the National Key Research and Development Program, China(Nos.2024YFC3015003, 2023YFC3011704), the Key Science and Technology Program of CHN Energy Group, China(No.E21010028504), the China University of Mining and Technology Postgraduate Innovation Program Project(Nos.2024WLKXJ140, 2024WLJCRCZL276, 2024WLKXJ143, 2024WLJCRCZL272, 2024WLJCRCZL195) and the Fundamental Research Funds for the Central Universities, China(Nos.2024-10967, 2024-10958)

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Abstract: Developing high-performance air filtration materials is of great significance in the increasingly harsh air environment. In this study, nanocrystalline MOF-801 was efficiently and controllably prepared via microwave-assisted synthesis. Subsequently, an electrospinning-electrospray strategy was employed to anchor the MOF nanocrystals onto the surface of PLA fibers while designing a unique Janus structure. The high-dielectric MOF nanocrystals significantly enhanced the electret effect of PLA fibers, imparting high dielectric constant (2.5) and initial surface potential (5.6 kV) to the PLA fibrous membrane, along with excellent charge storage and regeneration capabilities. The Janus structure exhibits synergistic effects of multiple filtration mechanisms, enabling hierarchical capture of particulate matters (PMs) with different particle sizes. Even under the highest airflow rate (85 L/min), the J-PLA/MOF fibrous membrane achieved ultra-high PM0.3 filtration efficiency (96.4%) and low air resistance (121.5 Pa). Additionally, under a differential pressure of 100 Pa, compared to the low air permeability (102.2 mm/s) exhibited by Normal PLA, the air permeability rate of the J-PLA/MOF fibrous membrane could reach up to 225.1 mm/s. Due to the anchoring of an appropriate amount of highly surface-active MOF nanocrystals, the mechanical properties of the J-PLA/MOF fibrous membrane were improved, with tensile strength and Young's modulus reaching as high as 4.7 MPa and 100.3 MPa, respectively. The J-PLA/MOF biodegradable fibrous membranes designed in this study held great potential for applications in ultrafine PMs filtration.

Key words: Ultrafine particulate matters, Poly(lactic acid) fiber, Metal-organic framework functionalization, Janus structure, Air permeability

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