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Enhancing the property of composite pervaporation desalination membrane by fabricating a less resistance substrate with porous but skinless surface structure

Desalination, ISSN: 0011-9164, Vol: 525, Page: 115496
2022
  • 18
    Citations
  • 0
    Usage
  • 7
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    18
    • Citation Indexes
      18
  • Captures
    7

Article Description

The fabrication methods for high performance pervaporation (PV) desalination membranes were complicated and difficult to be scaled-up. To address this issue, we developed a composite membrane using a porous polysulfone (PSF) membrane that was prepared by a conventional non-solvent induced phase inversion (NIPS) technology. The key was to design the PSF structure with a skinless, macro-void free and bi-continuous cross-sectional morphology for achieving an ultra-low transport resistance. This was done by incorporating non-solvent additives of polyvinylpyrrolidone (PVP) and propionic acid (PA) into the PSF polymer dope and regulating the temperature of the water coagulant. As a result, the PSF based PV composite membrane exhibited a high-water flux of 124.8 ± 3.2 kg/(m 2 ·h) and a salt rejection of 99.9% when separating a 3.5 wt% NaCl solution at 70 °C. Moreover, a water flux of 71.3 ± 1.8 kg/(m 2 ·h) was achieved for treating a high concentrated NaCl solution of 20 wt%. To our best knowledge, these PV membrane desalination performances overshadowed all reported PV composite membranes using substrates fabricated by the NIPs method. Most importantly, the easy-to-scale-up membrane fabrication method, as well as the excellent PV desalination performance, indicated a great potential for industrial applications.

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