Hydrophobic PVDF hollow fiber membranes with narrow pore size distribution and ultra-thin skin for the fresh water production through membrane distillation

Kai Yu Wang, Tai-Shung Chung*, Marek Gryta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

202 Scopus citations

Abstract

Polyvinylidene fluoride (PVDF) hydrophobic asymmetric hollow fiber membrane was fabricated through the dry-jet wet phase inversion process. It is found that the PVDF hollow fiber has an ultra-thin skin layer and a porous support layer from the morphology study. The fully porous membrane structure has the advantage of decreasing the vapor transport resistance and enhancing the permeation flux. The fabricated PVDF membrane has a mean pore size of 0.16 μ m in diameter and a narrow pore size distribution. The rough external surface produces an advancing contact angle of 112 ± 3{ring operator}with water. During direct contact membrane distillation (MD) of 3.5 wt% salt solution, PVDF hollow fibers produced a water permeation flux of 41.5 kg m- 2h- 1(based on the external diameter of hollow fiber) and a NaCl rejection of 99.99% with a hot salt solution at 79.3 °C and cold distillate water at 17.5 °C. This performance is comparable to or superior to most of commercially available PVDF hollow fiber membranes, indicating that the newly developed PVDF may be suitable for MD applications.

Original languageEnglish (US)
Pages (from-to)2587-2594
Number of pages8
JournalChemical Engineering Science
Volume63
Issue number9
DOIs
StatePublished - Jan 1 2008

Keywords

  • Desalination
  • Direct contact membrane distillation
  • Hollow fiber
  • PVDF

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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