Tailoring the permselectivity of water desalination membranes via nanoparticle assembly

Edwin P. Chan, William D. Mulhearn, Yun Ru Huang, Jung-hyun Lee, Daeyeon Lee, Christopher M. Stafford

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Thin film composite membranes can selectively separate mono- and divalent ions from water via solution-diffusion of each species through a dense but ultrathin, highly cross-linked polymer "skin" layer; water is transported across the membrane faster than associated salts. Changing the selectivity of the "skin" layer typically requires adjusting the monomer chemistries that make up the polymer "skin" layer, but doing so also impacts a host of other membrane properties. Here, we employ electrostatic layer-by-layer deposition of inorganic nanoparticles to enhance the permselectivity of an existing commercial nanofiltration membrane. We chose this approach because it is simple and robust and does not require any change to the underlying chemistry of the thin film composite (TFC) membrane. We found that a single layer of nanoparticles was sufficient to increase the permselectivity of the membrane by nearly 50%, compared to the virgin TFC membrane. In order to understand the mechanism for permselectivity enhancement, we developed a modified solution-diffusion model to account for the additional hydraulic resistance of the nanoparticle layer, which can faithfully capture the effect of nanoparticle layer thickness on the observed water and salt flux of the modified TFC membrane.

Original languageEnglish
Pages (from-to)611-616
Number of pages6
JournalLangmuir
Volume30
Issue number2
DOIs
Publication statusPublished - 2014 Jan 21
Externally publishedYes

Fingerprint

Composite membranes
Desalination
Nanoparticles
assembly
membranes
Membranes
Thin films
nanoparticles
Skin
Water
water
Polymers
Salts
Nanofiltration membranes
composite materials
thin films
Electrostatics
Monomers
Hydraulics
Ions

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Chan, E. P., Mulhearn, W. D., Huang, Y. R., Lee, J., Lee, D., & Stafford, C. M. (2014). Tailoring the permselectivity of water desalination membranes via nanoparticle assembly. Langmuir, 30(2), 611-616. https://doi.org/10.1021/la403718x

Tailoring the permselectivity of water desalination membranes via nanoparticle assembly. / Chan, Edwin P.; Mulhearn, William D.; Huang, Yun Ru; Lee, Jung-hyun; Lee, Daeyeon; Stafford, Christopher M.

In: Langmuir, Vol. 30, No. 2, 21.01.2014, p. 611-616.

Research output: Contribution to journalArticle

Chan, EP, Mulhearn, WD, Huang, YR, Lee, J, Lee, D & Stafford, CM 2014, 'Tailoring the permselectivity of water desalination membranes via nanoparticle assembly', Langmuir, vol. 30, no. 2, pp. 611-616. https://doi.org/10.1021/la403718x
Chan, Edwin P. ; Mulhearn, William D. ; Huang, Yun Ru ; Lee, Jung-hyun ; Lee, Daeyeon ; Stafford, Christopher M. / Tailoring the permselectivity of water desalination membranes via nanoparticle assembly. In: Langmuir. 2014 ; Vol. 30, No. 2. pp. 611-616.
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