Design of ultrathin nanostructured polyelectrolyte-based membranes with high perchlorate rejection and high permeability

Oishi Sanyal, Anna N. Sommerfeld, Ilsoon Lee

Research output: Contribution to journalArticle

  • 15 Citations

Abstract

The presence of perchlorate in drinking water sources is an issue of overwhelming concern in United States. Commercial reverse osmosis (RO) membranes show high rejection of perchlorate ions but with very low water permeability. We propose the modification of commercial nanofiltration (NF) membranes by layer-by-layer (LbL) assembly in order to enhance the ion rejection of these membranes to the same level as commercial RO membranes, but with much higher permeability. Poly allylamine hydrochloride (PAH) and poly acrylic acid (PAA) were the two polyelectrolytes used for surface modification. We found that, when both these polyelectrolytes were deposited on a NF 90 membrane at a pH of 6.5 and crosslinked with glutaraldehyde, we were able to achieve around 93% perchlorate rejection at a pressure of 5 bar with 10 ppm feed concentration. This was almost equal to the rejection offered by SW 30 membrane and higher than a BW 30 membrane under the same conditions of pressure and feed concentration. Most importantly, the modified membranes had 1.5 times the permeability of BW 30 membrane and 6 times that of SW 30. These membranes, therefore, had much superior permselectivity than the commercial membranes. In fact, this was one of the highest values of permselectivity reported so far for a PEM-based RO membrane targeting monovalent ion removal. Only 3 bilayers, with an overall thickness of just 20 Å, were sufficient to achieve such a high rejection. The mechanism of ion rejection by these modified membranes was based on size-based exclusion rather than charge-based separation.

LanguageEnglish (US)
Pages113-119
Number of pages7
JournalSeparation and Purification Technology
Volume145
DOIs
StatePublished - Mar 10 2015

Profile

Polyelectrolytes
Membranes
Osmosis membranes
Reverse osmosis
Nanofiltration membranes
Ions
perchlorate
Glutaral
Potable water
Drinking Water
Acrylics
Surface treatment
Acids
Water

Keywords

  • Layer-by-layer assembly
  • Perchlorate rejection
  • Permselectivity
  • Polyelectrolyte multilayer membranes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

Design of ultrathin nanostructured polyelectrolyte-based membranes with high perchlorate rejection and high permeability. / Sanyal, Oishi; Sommerfeld, Anna N.; Lee, Ilsoon.

In: Separation and Purification Technology, Vol. 145, 10.03.2015, p. 113-119.

Research output: Contribution to journalArticle

@article{b8cf472d32954032a9135cb87ec72203,
title = "Design of ultrathin nanostructured polyelectrolyte-based membranes with high perchlorate rejection and high permeability",
abstract = "The presence of perchlorate in drinking water sources is an issue of overwhelming concern in United States. Commercial reverse osmosis (RO) membranes show high rejection of perchlorate ions but with very low water permeability. We propose the modification of commercial nanofiltration (NF) membranes by layer-by-layer (LbL) assembly in order to enhance the ion rejection of these membranes to the same level as commercial RO membranes, but with much higher permeability. Poly allylamine hydrochloride (PAH) and poly acrylic acid (PAA) were the two polyelectrolytes used for surface modification. We found that, when both these polyelectrolytes were deposited on a NF 90 membrane at a pH of 6.5 and crosslinked with glutaraldehyde, we were able to achieve around 93{\%} perchlorate rejection at a pressure of 5 bar with 10 ppm feed concentration. This was almost equal to the rejection offered by SW 30 membrane and higher than a BW 30 membrane under the same conditions of pressure and feed concentration. Most importantly, the modified membranes had 1.5 times the permeability of BW 30 membrane and 6 times that of SW 30. These membranes, therefore, had much superior permselectivity than the commercial membranes. In fact, this was one of the highest values of permselectivity reported so far for a PEM-based RO membrane targeting monovalent ion removal. Only 3 bilayers, with an overall thickness of just 20 {\AA}, were sufficient to achieve such a high rejection. The mechanism of ion rejection by these modified membranes was based on size-based exclusion rather than charge-based separation.",
keywords = "Layer-by-layer assembly, Perchlorate rejection, Permselectivity, Polyelectrolyte multilayer membranes",
author = "Oishi Sanyal and Sommerfeld, {Anna N.} and Ilsoon Lee",
year = "2015",
month = "3",
day = "10",
doi = "10.1016/j.seppur.2015.03.011",
language = "English (US)",
volume = "145",
pages = "113--119",
journal = "Separation and Purification Technology",
issn = "1383-5866",
publisher = "Elsevier",

}

TY - JOUR

T1 - Design of ultrathin nanostructured polyelectrolyte-based membranes with high perchlorate rejection and high permeability

AU - Sanyal,Oishi

AU - Sommerfeld,Anna N.

AU - Lee,Ilsoon

PY - 2015/3/10

Y1 - 2015/3/10

N2 - The presence of perchlorate in drinking water sources is an issue of overwhelming concern in United States. Commercial reverse osmosis (RO) membranes show high rejection of perchlorate ions but with very low water permeability. We propose the modification of commercial nanofiltration (NF) membranes by layer-by-layer (LbL) assembly in order to enhance the ion rejection of these membranes to the same level as commercial RO membranes, but with much higher permeability. Poly allylamine hydrochloride (PAH) and poly acrylic acid (PAA) were the two polyelectrolytes used for surface modification. We found that, when both these polyelectrolytes were deposited on a NF 90 membrane at a pH of 6.5 and crosslinked with glutaraldehyde, we were able to achieve around 93% perchlorate rejection at a pressure of 5 bar with 10 ppm feed concentration. This was almost equal to the rejection offered by SW 30 membrane and higher than a BW 30 membrane under the same conditions of pressure and feed concentration. Most importantly, the modified membranes had 1.5 times the permeability of BW 30 membrane and 6 times that of SW 30. These membranes, therefore, had much superior permselectivity than the commercial membranes. In fact, this was one of the highest values of permselectivity reported so far for a PEM-based RO membrane targeting monovalent ion removal. Only 3 bilayers, with an overall thickness of just 20 Å, were sufficient to achieve such a high rejection. The mechanism of ion rejection by these modified membranes was based on size-based exclusion rather than charge-based separation.

AB - The presence of perchlorate in drinking water sources is an issue of overwhelming concern in United States. Commercial reverse osmosis (RO) membranes show high rejection of perchlorate ions but with very low water permeability. We propose the modification of commercial nanofiltration (NF) membranes by layer-by-layer (LbL) assembly in order to enhance the ion rejection of these membranes to the same level as commercial RO membranes, but with much higher permeability. Poly allylamine hydrochloride (PAH) and poly acrylic acid (PAA) were the two polyelectrolytes used for surface modification. We found that, when both these polyelectrolytes were deposited on a NF 90 membrane at a pH of 6.5 and crosslinked with glutaraldehyde, we were able to achieve around 93% perchlorate rejection at a pressure of 5 bar with 10 ppm feed concentration. This was almost equal to the rejection offered by SW 30 membrane and higher than a BW 30 membrane under the same conditions of pressure and feed concentration. Most importantly, the modified membranes had 1.5 times the permeability of BW 30 membrane and 6 times that of SW 30. These membranes, therefore, had much superior permselectivity than the commercial membranes. In fact, this was one of the highest values of permselectivity reported so far for a PEM-based RO membrane targeting monovalent ion removal. Only 3 bilayers, with an overall thickness of just 20 Å, were sufficient to achieve such a high rejection. The mechanism of ion rejection by these modified membranes was based on size-based exclusion rather than charge-based separation.

KW - Layer-by-layer assembly

KW - Perchlorate rejection

KW - Permselectivity

KW - Polyelectrolyte multilayer membranes

UR - http://www.scopus.com/inward/record.url?scp=84925782516&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84925782516&partnerID=8YFLogxK

U2 - 10.1016/j.seppur.2015.03.011

DO - 10.1016/j.seppur.2015.03.011

M3 - Article

VL - 145

SP - 113

EP - 119

JO - Separation and Purification Technology

T2 - Separation and Purification Technology

JF - Separation and Purification Technology

SN - 1383-5866

ER -