High-performance support-free molecular layer-by-layer assembled forward osmosis membrane incorporated with graphene oxide

Soon Bum Kwon, Youngjin Kim, Seockheon Lee, Seungkwan Hong

Research output: Contribution to journalArticlepeer-review

Abstract

Forward osmosis (FO) membranes generally have a thin-film composite (TFC) structure comprising an ultrafiltration (UF)-grade support layer and a polyamide (PA) active layer. However, the lack of high-performance membranes limits FO. To improve the FO performance, internal concentration polarization (ICP) should be controlled to reduce the water flux within the support layer. In this study, a novel support-free molecular layer-by-layer (SF-mLbL) technique using a microfiltration (MF)-grade support layer for minimum ICP was applied to produce a robust and uniform active layer, even on large pores of the support layer. Based on the location of graphene oxide (GO) nanoparticles, thin-film nanocomposite (TFN) and thin-film nanocomposite-interlayer (TFNi) membranes were fabricated. Among these, the TFNi membrane with the highest performance contained 0.7 wt% GO nanoparticles and was stacked in 15 cycles. The 0.7 wt%-15 cycles TFNi membrane showed high water flux (87.18 ± 0.15 LMH) and low reverse salt flux (5.06 ± 0.11 gMH) when deionized (DI) water and 0.5 M NaCl solution were used as feed and draw solutions, respectively, in FO mode. This study demonstrates that the SF-mLbL technique is suitable for manufacturing high-performance FO membranes.

Original languageEnglish
Article number122152
JournalJournal of Membrane Science
Volume689
DOIs
Publication statusPublished - 2024 Jan 5

Bibliographical note

Publisher Copyright:
© 2023

Keywords

  • Forward osmosis
  • Graphene oxide
  • Support-free molecular layer-by-layer
  • Thin film nanocomposite
  • Thin film nanocomposite-interlayer

ASJC Scopus subject areas

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

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