Fabrication of polyamide thin film composite reverse osmosis membranes via support-free interfacial polymerization

Sung Joon Park, Wansuk Choi, Seung Eun Nam, Seungkwan Hong, Jong Suk Lee, Jung-hyun Lee

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

We report a fabrication method of polyamide (PA) thin film composite reverse osmosis membranes, so-called support-free interfacial polymerization (SFIP). In contrast to conventional interfacial polymerization (IP) where a PA layer is formed in-situ on top of a support, in this SFIP method the PA layer is first formed at the interface without a support, followed by attachment onto a support. Enhancing the chemical adhesion between the PA layer and a polyacrylonitrile support through the chemical modification on the support leads to the fabrication of defect-free membranes which outperform the conventional IP-assembled membranes. Importantly, SFIP allows for the precise characterization of the PA layer and the PA-support interface by easily isolating each membrane component. SFIP produces a thinner and smoother PA structure with a more wettable and less negatively charged surface than its IP-assembled counterparts, presumably due to uniform and promoted amine diffusion during film formation. Furthermore, it was found that the bottom surface of the SFIP-assembled PA has a porous structure with higher hydrophilicity and a marginally lower negative charge than its opposite surface. The SFIP method provides a versatile platform to study the fundamental membrane structure-performance relationship and to develop high performance membranes.

Original languageEnglish
Pages (from-to)52-59
Number of pages8
JournalJournal of Membrane Science
Volume526
DOIs
Publication statusPublished - 2017 Mar 15

Keywords

  • Desalination
  • Interfacial adhesion
  • Polyamide thin film composite membrane
  • Reverse osmosis
  • Support-free interfacial polymerization

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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