Layer-by-layer assembly of inorganic nanosheets and polyelectrolytes for reverse osmosis composite membranes

Jungkyu Choi, Hyemin Sung, Yongmin Ko, Seunghye Lee, Wanseok Choi, Joona Bang, Jinhan Cho

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this study, we introduce a layer-by-layer (LbL) assembly method to prepare a reverse osmosis (RO) desalination membrane that consists of a hybrid combination of [polyelectrolyte (PE)/montmorillonite (MTM)]n layers. First, adopting poly(allylamine hydrochloride) (PAH) for a PE layer, an RO test showed that the permeate flux of water through (PAH/ MTM)n multilayer-coated membranes decreased from -25.5 to - 8.3 L·m_2·h_1 with the increased bilayer number from n = 9 to n = 18. At the same time, the corresponding ion rejection with respect to NaCl is increased from -30 to - 81%. Despite the increased ion rejection performance, (PAH/MTM)n membranes exhibit a poor chlorine resistance, as frequently observed in commercial polyamide-based RO membranes. In our previous study, it was noted that the RO membranes, prepared just from the PE multilayers (i.e., [PAH/poly(acrylic acid) (PAA)]n layers), showed a marked chlorine tolerance, but concomitantly very low permeate flux (-4-5 L·m_2·h_1). Considering the significant drawback in each case (poor chlorine tolerance for (PAH/MTM)n layers and low permeate flux for (PAH/PAA)n layers), we proposed to combine the layer constituents primarily by inserting PAH/PAA layers between two adjacent PAH/MTM layers. Indeed, the flux is maintained at -7.5±0.5 L·m_2·h_1, comparable to commercial membranes, while the salt rejection ability is as high as - 75±2.5% and the stability against the chlorine attack is well preserved with - 74±5.0% ion rejection after the NaOCl treatment.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalJournal of Chemical Engineering of Japan
Volume47
Issue number2
DOIs
Publication statusPublished - 2014 Feb 26

Fingerprint

Osmosis membranes
Nanosheets
Composite membranes
Reverse osmosis
Polycyclic aromatic hydrocarbons
Polyelectrolytes
carbopol 940
Bentonite
Clay minerals
Chlorine
Fluxes
Acrylics
Membranes
Ions
Acids
Multilayers
Nylons
Desalination
Polyamides
Salts

Keywords

  • Electrostatic interaction
  • Layer-by-layer assembly
  • Montmorillon-ite (MTM) nanosheet
  • Polyelectrolyte layers
  • RO membrane

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Layer-by-layer assembly of inorganic nanosheets and polyelectrolytes for reverse osmosis composite membranes. / Choi, Jungkyu; Sung, Hyemin; Ko, Yongmin; Lee, Seunghye; Choi, Wanseok; Bang, Joona; Cho, Jinhan.

In: Journal of Chemical Engineering of Japan, Vol. 47, No. 2, 26.02.2014, p. 180-186.

Research output: Contribution to journalArticle

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AU - Sung, Hyemin

AU - Ko, Yongmin

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AU - Choi, Wanseok

AU - Bang, Joona

AU - Cho, Jinhan

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