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Microphase Diffusion-Controlled Interfacial Polymerization for an Ultrahigh Permeability Nanofiltration Membrane.

Linglong Shan1, Jiahui Gu2, Hongwei Fan2

  • 1Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology , Beijing 100124, P. R. China.

ACS Applied Materials & Interfaces
|December 7, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed an ultrathin nanofiltration membrane using microphase diffusion-controlled interfacial polymerization. This novel method significantly enhances membrane permeance while maintaining high rejection rates for improved water purification.

Keywords:
interfacial polymerizationmicrophase diffusion-controllednanofiltrationnatural organic mattersprayultrathin

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Membrane Technology

Background:

  • Improving nanofiltration membrane performance requires thinner membranes with high rejection.
  • Conventional interfacial polymerization (CIP) methods face limitations in achieving ultrathin membrane layers.

Purpose of the Study:

  • To develop an ultrathin polyamide layer for nanofiltration membranes.
  • To investigate a new formation mechanism for ultrathin membranes using microphase diffusion-controlled interfacial polymerization (MDC-IP).

Main Methods:

  • Fabrication of a 25 nm ultrathin polyamide layer via microphase diffusion-controlled interfacial polymerization (MDC-IP) of poly(ethyleneimine) and trimesoyl chloride.
  • Post-cross-linking of the polyamide layer to create a dual-cross-linked interwoven structure.
  • Characterization of membrane properties, including permeance and rejection.

Main Results:

  • The MDC-IP method produced a significantly thinner polyamide layer (25 nm) compared to CIP.
  • A novel formation mechanism involving microphase interfacial reaction and elimination of loose layers was elucidated.
  • The resulting membrane exhibited an ultrahigh permeance of 1246 kg/(m² h MPa), 23 times greater than CIP membranes.

Conclusions:

  • Microphase diffusion-controlled interfacial polymerization (MDC-IP) offers a facile and effective approach for nanoscale membrane regulation.
  • The ultrathin, dual-cross-linked membranes demonstrate superior permeance, paving the way for advanced nanofiltration applications.