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Green-Solvent-Processable Composite Micro/Nanofiber Membrane with Gradient Asymmetric Structure for Efficient

Keyu Ji1,2,3, Chengkun Liu1,2,3, Haijun He4

  • 1School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 20, 2023
PubMed
Summary
This summary is machine-generated.

This study optimized electrospun polyvinyl formal acetal (PVFA) membranes for water treatment. The resulting composite membranes show excellent strength, high particle retention, and good water flux, demonstrating potential for microfiltration applications.

Keywords:
electrospinninggradient asymmetric structuresnanofiber membranespolyvinyl formal acetalwater treatment

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Electrospinning is a key technique for creating nanofiber membranes from various polymers.
  • Polyvinyl formal acetal (PVFA) possesses desirable properties like high strength and heat resistance, but its use in electrospun water treatment membranes is unexplored.
  • Developing novel materials for efficient water purification is crucial.

Purpose of the Study:

  • To optimize the electrospinning process for polyvinyl formal acetal (PVFA) nanofiber membranes.
  • To investigate the impact of sodium chloride (NaCl) on membrane properties and microfiltration performance.
  • To construct and evaluate a composite micro/nanofiber membrane for water treatment applications.

Main Methods:

  • Optimized electrospinning parameters for PVFA.
  • Incorporated sodium chloride (NaCl) during electrospinning to modify membrane characteristics.
  • Fabricated a composite membrane by combining a hydrophobic PVFA nanofiber layer with a hydrophilic nonwoven support.
  • Assessed membrane properties including tensile strength, particle retention, and water flux.
  • Evaluated membrane performance over multiple uses.

Main Results:

  • Optimized electrospinning process yielded PVFA nanofiber membranes.
  • Sodium chloride (NaCl) addition influenced the physical, mechanical, and microfiltration properties.
  • The composite membrane exhibited a pore-size gradient and asymmetric hydrophilic/hydrophobic structure.
  • Achieved a tensile breaking strength of 37.8 MPa.
  • Demonstrated a 99.7% retention rate for 0.1-0.3 µm particles.
  • Obtained a water flux of 513.4 L m⁻² h⁻¹ under hydrostatic pressure.
  • Maintained over 98% retention after three reuse cycles.

Conclusions:

  • The developed electrospun PVFA composite membrane is suitable for microfiltration.
  • The membrane possesses excellent mechanical strength, high filtration efficiency, and durability.
  • This novel membrane technology shows significant promise for advanced water treatment solutions.