Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl-/SO42- selectivity

Ahmad, Muhammad; Tang, Chao; Yang, Liu; Yaroshchuk, Andriy; Bruening, Merlin L.

doi:10.1016/j.memsci.2019.02.018

Title: Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl^-/SO₄^2- selectivity

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Abstract

Development of anion-exchange membranes (AEMs) with selectivities among anions may expand the applications of these membranes in salt separations. This work shows that layer-by-layer coating of aliphatic polyamide AEMs with poly(4-styrenesulfonate) (PSS)/protonated poly(allylamine) (PAH) films enhances Cl^-/SO₄^2- dialysis selectivities, and the extent of this enhancement depends on the source-phase salt concentrations. For a source phase containing 0.01 M NaCl and 0.01 M Na₂SO₄ and a receiving phase of 0.01 M Na₂CO₃, a (PSS/PAH)₅PSS coating (5 PSS/PAH “bilayers” capped with a layer of PSS) increases the Cl^-/SO₄^2- selectivity from 1.7 to 5.3 in diffusion dialysis and from 1.3 to 7.4 in electrodialysis. Remarkably, the diffusion dialysis selectivity of a coated membrane increases to 140 when the salt concentrations in the source phase are 0.1 M. Even with bare membranes, selectivity increases to 13 with 0.1 M source-phase salt concentrations. Moreover, AEMs coated only on the receiving side show much higher selectivities but lower fluxes than those coated only on the source side. In conclusion, partitioning experiments and modelling suggest that the increased Cl^-/SO₄^2- selectivities at high source-phase salt concentrations stem from enhanced Cl^- partitioning and electromigration that disproportionately decreases SO₄^2- flux in the AEM.

Authors:

Ahmad, Muhammad ^[1]; Tang, Chao ^[1]; Yang, Liu ^[1]; Yaroshchuk, Andriy ^[2]; Bruening, Merlin L. ^[1]

Univ. of Notre Dame, IN (United States)
ICREA, Barcelona (Spain); Polytechnic University of Catalonia, Barcelona (Spain)

Publication Date:: Sat Feb 16 00:00:00 EST 2019

Research Org.:: University of Notre Dame, IN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division

OSTI Identifier:: 1597629

Alternate Identifier(s):: OSTI ID: 1547741

Grant/Contract Number:: SC0017618

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Membrane Science

Additional Journal Information:: Journal Volume: 578; Journal Issue: C; Related Information: https://ars.els-cdn.com/content/image/1-s2.0-S0376738819301449-mmc1.pdf; Journal ID: ISSN 0376-7388

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ion-exchange membranes; Layer-by-layer; Polyelectrolytes; Dialysis; Selectivity

Citation Formats


                    Ahmad, Muhammad, Tang, Chao, Yang, Liu, Yaroshchuk, Andriy, and Bruening, Merlin L. Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl-/SO42- selectivity.  United States: N. p., 2019. 
Web.  doi:10.1016/j.memsci.2019.02.018.

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                    Ahmad, Muhammad, Tang, Chao, Yang, Liu, Yaroshchuk, Andriy, & Bruening, Merlin L. Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl-/SO42- selectivity.  United States.  https://doi.org/10.1016/j.memsci.2019.02.018

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                    Ahmad, Muhammad, Tang, Chao, Yang, Liu, Yaroshchuk, Andriy, and Bruening, Merlin L. Sat .  
"Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl-/SO42- selectivity".  United States.  https://doi.org/10.1016/j.memsci.2019.02.018.  https://www.osti.gov/servlets/purl/1597629.

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@article{osti_1597629,

  title        = {Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl-/SO42- selectivity},

  author       = {Ahmad, Muhammad and Tang, Chao and Yang, Liu and Yaroshchuk, Andriy and Bruening, Merlin L.},

  abstractNote = {Development of anion-exchange membranes (AEMs) with selectivities among anions may expand the applications of these membranes in salt separations. This work shows that layer-by-layer coating of aliphatic polyamide AEMs with poly(4-styrenesulfonate) (PSS)/protonated poly(allylamine) (PAH) films enhances Cl-/SO42- dialysis selectivities, and the extent of this enhancement depends on the source-phase salt concentrations. For a source phase containing 0.01 M NaCl and 0.01 M Na2SO4 and a receiving phase of 0.01 M Na2CO3, a (PSS/PAH)5PSS coating (5 PSS/PAH “bilayers” capped with a layer of PSS) increases the Cl-/SO42- selectivity from 1.7 to 5.3 in diffusion dialysis and from 1.3 to 7.4 in electrodialysis. Remarkably, the diffusion dialysis selectivity of a coated membrane increases to 140 when the salt concentrations in the source phase are 0.1 M. Even with bare membranes, selectivity increases to 13 with 0.1 M source-phase salt concentrations. Moreover, AEMs coated only on the receiving side show much higher selectivities but lower fluxes than those coated only on the source side. In conclusion, partitioning experiments and modelling suggest that the increased Cl-/SO42- selectivities at high source-phase salt concentrations stem from enhanced Cl- partitioning and electromigration that disproportionately decreases SO42- flux in the AEM.},

  doi          = {10.1016/j.memsci.2019.02.018},

  journal      = {Journal of Membrane Science},

  number       = C,

  volume       = 578,

  place        = {United States},

  year         = {Sat Feb 16 00:00:00 EST 2019},

  month        = {Sat Feb 16 00:00:00 EST 2019}

}

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Title: Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl-/SO42- selectivity

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Title: Layer-by-layer modification of aliphatic polyamide anion-exchange membranes to increase Cl^-/SO₄^2- selectivity