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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Polymeric nanofiber membranes (PNMs) face limitations in mechanical strength and stability, particularly for oily water separation.
  • Existing membranes struggle with harsh conditions and fouling, hindering efficient oil-water separation.

Purpose of the Study:

  • To enhance the mechanical strength, stability, and hydrophilicity of PNMs for demanding applications.
  • To develop a novel membrane structure for improved oily water separation performance.

Main Methods:

  • Sequential crystallization of covalent organic framework (COF) and poly(ether-etherketone) (PEEK).
  • Integration of a superhydrophilic COF nanoarray layer into PEEK nanofibers.
  • Creation of a mechanical interlocking structure via polymer chain entanglement and hetero-interpenetration.

Main Results:

  • Achieved enhanced mechanical properties with a tensile strength of 16.2 MPa.
  • Demonstrated superior stability under harsh conditions.
  • Significantly improved emulsion permeance (3.4 × 10^4 L m⁻² h⁻¹ bar⁻¹) with minimal irreversible fouling over 100 cycles.

Conclusions:

  • The developed COF-PEEK PNMs exhibit exceptional mechanical strength, stability, and hydrophilicity.
  • The mechanical interlocking structure and COF nanoarray are key to the enhanced performance.
  • These advanced membranes surpass state-of-the-art materials for oily water separation.