Multi-layer structure toward simultaneous enhancement of forward osmosis membrane separation performance and anti-biofouling property

Peng Fei Sun, Pulak Sarkar, Eun Tae Yun, Jeong Hoon Lee, Chuyang Y. Tang, Hee Deung Park

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Biofouling is a critical issue in membrane-based water-treatment processes because the feed solution retains microorganisms despite rigorous pretreatment. The forward osmosis (FO) process has a drawback of severe biofouling tendency when the active layer faces the draw solution. Here, we fabricated a thin-film nanocomposite membrane with a multilayer structure consisting of an MXene/carbon nanotubes (MXene/CNT) interlayer and a CNT back layer (TFNi-CNT). The interlayer structure significantly enhanced the membrane separation performance whereas the CNT back layer did not significantly hamper the performance. The biofilm formed on the CNT back layer surface was reduced by approximately 90% compared to that on the pristine substrate, indicating that the CNT back layer has superior antibiofilm properties. The water flux of the TFNi-CNT membrane was well-maintained (approximately 46%) and reversibly recovered through facile physical flushing, even after four dynamic biofouling cycles, whereas that of the pristine membrane was reduced to approximately 10%. These results indicated that the TFNi-CNT membrane possesses excellent resistance to biofouling. The CNT layer acts as a barrier that effectively prevents bacteria from entering the inner porous substrate, thus alleviating the detrimental biofilm-enhanced internal concentration polarization. This study provides new insights into the rational design and fabrication of FO membranes to mitigate biofouling.

Original languageEnglish
Article number121804
JournalJournal of Membrane Science
Volume683
DOIs
Publication statusPublished - 2023 Oct 5

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Carbon nanotubes
  • Forward osmosis
  • Interlayer
  • MXene
  • Membrane biofouling

ASJC Scopus subject areas

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

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