CF4 plasma-modified superhydrophobic PVDF membranes for direct contact membrane distillation

Chi Yang, Xue Mei Li, Jack Gilron, Ding feng Kong, Yong Yin, Yoram Oren, Charles Linder, Tao He

Research output: Contribution to journalArticlepeer-review

201 Scopus citations

Abstract

High performance superhydrophobic PVDF flat sheet membranes for direct contact membrane distillation (DCMD) were prepared via CF4 plasma surface modification. The performance of the virgin and CF4 modified membranes was examined using sodium chloride solution (4wt%) as feed in a DCMD process. Results reveal that CF4 surface modification yielded superhydrophobic membranes (water contact angle: 162.4°) with about 30% higher water flux than the virgin PVDF membrane. The underlying mechanism that leads to the significant improvement in membrane performance was investigated in detail with respect to membrane morphology, gas permeability, liquid entry pressure, and contact angle measurements. Results indicate that the combination of increased gas permeability and superhydrophobicity contributes mostly to the improved water flux.

Original languageEnglish
Pages (from-to)155-161
Number of pages7
JournalJournal of Membrane Science
Volume456
DOIs
StatePublished - 15 Apr 2014

Keywords

  • Contact angle
  • Membrane distillation
  • PVDF
  • Plasma
  • Superhydrophobic

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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