Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (2): 20240426.doi: 10.7503/cjcu20240426

• Polymer Chemistry • Previous Articles     Next Articles

ZIF-8 Nanosheet-functionalized Poly(lactic acid) Nanofibrous Membranes for Efficient Filtration of Ultrafine Particles

WANG Shengcheng1, WANG Cunmin2, HAO Yaxin2, ZHU Guiying3, LI Xinyu2, SONG Xinyi2, ZHANG Mingming4, XU Huan3, HE Xinjian2()   

  1. 1.School of Civil Engineering,Xuzhou University of Technology,Xuzhou 221018,China
    2.School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China
    3.School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China
    4.China Academy of Safety Science and Technology,Beijing 100012,China
  • Received:2024-09-14 Online:2025-02-10 Published:2024-11-25
  • Contact: HE Xinjian E-mail:xinjian.he@cumt.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(52174222);the National Key Research and Development

Abstract:

Zeolite imidazolate framework-8(ZIF-8) nanosheets(ZIF-8-NS) with high specific surface area were prepared by micro-assisted synthesis method, and uniformly dispersed into poly(lactic acid)(PLA) solution as nano-dielectrics, then ZIF-8-NS-functionalized PLA(PLA/ZIF-8-NS) nanofibers were prepared by electrospinning to improve the filtration efficiency and to achieve the long-lasting respiratory protection for the operators. The microstructure and properties of the prepared PLA/ZIF-8-NS nanofibrous membranes were investigated. It was found that the addition of ZIF-8-NS resulted in a significant refinement of PLA/ZIF-8-NS fibers(253 nm) and an increase in fiber surface roughness. The surface potential of PLA/ZIF-8-NS nanofibrous membrane reached 10.4 kV and the dielectric constant reached 2.71, demonstrating excellent charge storage capability. At the same time, the PLA/ZIF-8-NS nanofibrous membrane was given excellent filtration performance for ultrafine particles, and the filtration efficiency for PM0.3 and PM0.3—2.5 reached 95.57% and 99.95% respectively under the high air flow rate of 85 L/min, with an air resistance of 305.3 Pa, and the filtration efficiency for PM0.3 still maintained at a high level of 98.50% after 360 min of filtration. In addition, the PLA/ZIF-8-NS nanofibrous membrane exhibited superior antimicrobial properties, with an inhibition rate of 99.9% against Staphylococcus aureus. These results indicate that PLA/ZIF-8-NS nanofibrous membranes have great potential to achieve long-term filtration and low resistance to ultrafine particles, which can provide an important safeguard for respiratory health protection of personnel operating in high dust concentration environment.

Key words: Poly(lactic acid), Nanofibrous membrane, Zeolite imidazolate framework-8 nanosheets, Interface polarization, Long-term filtration

CLC Number: 

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