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High-performance membranes with full pH-stability.

Nick Daems1, Sam Milis1, Rhea Verbeke1

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Summary

A new nanofiltration membrane made from grafted polyvinylidene fluoride and polystyrene sulfonic acid offers high chemical and thermal stability. This advanced membrane provides excellent selectivity and flux for industrial applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Membrane Technology

Background:

  • Growing industrial demand for high-performance separation membranes.
  • Need for membranes with broad chemical and thermal stability for diverse applications.

Purpose of the Study:

  • To develop a novel nanofiltration membrane with enhanced selectivity, flux, and stability.
  • To meet the stringent requirements of industries like paper, food, and mining.

Main Methods:

  • Grafting polyvinylidene fluoride (PVDF) with polystyrene sulfonic acid (PSSA).
  • Characterization of membrane performance including selectivity, flux, chemical, and thermal stability.

Main Results:

  • The optimized PVDF-PSSA membrane exhibits water permeances of 2.4 L h⁻¹ m⁻² bar⁻¹.
  • High retention rates achieved for NaCl (≈60%), MgSO₄ (≈80%), and Rhodamine B (>96%).
  • Demonstrated chemical stability across the full pH range (0-14) and thermal stability up to 120 °C.

Conclusions:

  • The developed nanofiltration membrane offers a unique combination of high performance and robust stability.
  • This novel membrane is suitable for demanding industrial separation processes requiring broad chemical and thermal resistance.