Modeling water flux and salt rejection of mesoporous γ-alumina and microporous organosilica membranes

A. Farsi, V. Boffa, H.F. Qureshi, Arian Nijmeijer, Aloysius J.A. Winnubst, M. Lykkegaard Christensen

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

The water and ion transport through a mesoporous γ-alumina membrane and a microporous organosilica membrane was simulated using the extended Nernst Planck equation combined with models for Donnan, steric and dielectric interfacial exclusion mechanisms. Due to the surface charge within the pore, the electroviscous effect was introduced in the model. The modified model fits well the rejection and permeability data for both membranes. The organosilica membrane shows a higher selectivity compared to the γ-alumina membrane, but the permeate flux is lower. At low ionic strength the electroviscous effect lowers the water flux through the γ-alumina membrane. The electroviscous effect is negligible for the organosilica membrane because its absolute surface potential ( 20 mV) is low compared to the γ-alumina membrane ( 60 mV). The simulation shows that the electroviscous effect should be included for the membranes with high surface potential (420 mV) and a pore size below 2–5 times of the electroviscous double layer thickness.
Original languageEnglish
Pages (from-to)307-315
JournalJournal of membrane science
Volume470
DOIs
Publication statusPublished - 2014

Fingerprint

Aluminum Oxide
rejection
Alumina
aluminum oxides
Salts
Fluxes
membranes
salts
Membranes
Water
water
Surface potential
porosity
Ion Transport
Surface charge
Ionic strength
exclusion
Osmolar Concentration
Pore size
Permeability

Keywords

  • METIS-309123
  • IR-94182

Cite this

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title = "Modeling water flux and salt rejection of mesoporous γ-alumina and microporous organosilica membranes",
abstract = "The water and ion transport through a mesoporous γ-alumina membrane and a microporous organosilica membrane was simulated using the extended Nernst Planck equation combined with models for Donnan, steric and dielectric interfacial exclusion mechanisms. Due to the surface charge within the pore, the electroviscous effect was introduced in the model. The modified model fits well the rejection and permeability data for both membranes. The organosilica membrane shows a higher selectivity compared to the γ-alumina membrane, but the permeate flux is lower. At low ionic strength the electroviscous effect lowers the water flux through the γ-alumina membrane. The electroviscous effect is negligible for the organosilica membrane because its absolute surface potential ( 20 mV) is low compared to the γ-alumina membrane ( 60 mV). The simulation shows that the electroviscous effect should be included for the membranes with high surface potential (420 mV) and a pore size below 2–5 times of the electroviscous double layer thickness.",
keywords = "METIS-309123, IR-94182",
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year = "2014",
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language = "English",
volume = "470",
pages = "307--315",
journal = "Journal of membrane science",
issn = "0376-7388",
publisher = "Elsevier",

}

Modeling water flux and salt rejection of mesoporous γ-alumina and microporous organosilica membranes. / Farsi, A.; Boffa, V.; Qureshi, H.F.; Nijmeijer, Arian; Winnubst, Aloysius J.A.; Lykkegaard Christensen, M.

In: Journal of membrane science, Vol. 470, 2014, p. 307-315.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Modeling water flux and salt rejection of mesoporous γ-alumina and microporous organosilica membranes

AU - Farsi, A.

AU - Boffa, V.

AU - Qureshi, H.F.

AU - Nijmeijer, Arian

AU - Winnubst, Aloysius J.A.

AU - Lykkegaard Christensen, M.

PY - 2014

Y1 - 2014

N2 - The water and ion transport through a mesoporous γ-alumina membrane and a microporous organosilica membrane was simulated using the extended Nernst Planck equation combined with models for Donnan, steric and dielectric interfacial exclusion mechanisms. Due to the surface charge within the pore, the electroviscous effect was introduced in the model. The modified model fits well the rejection and permeability data for both membranes. The organosilica membrane shows a higher selectivity compared to the γ-alumina membrane, but the permeate flux is lower. At low ionic strength the electroviscous effect lowers the water flux through the γ-alumina membrane. The electroviscous effect is negligible for the organosilica membrane because its absolute surface potential ( 20 mV) is low compared to the γ-alumina membrane ( 60 mV). The simulation shows that the electroviscous effect should be included for the membranes with high surface potential (420 mV) and a pore size below 2–5 times of the electroviscous double layer thickness.

AB - The water and ion transport through a mesoporous γ-alumina membrane and a microporous organosilica membrane was simulated using the extended Nernst Planck equation combined with models for Donnan, steric and dielectric interfacial exclusion mechanisms. Due to the surface charge within the pore, the electroviscous effect was introduced in the model. The modified model fits well the rejection and permeability data for both membranes. The organosilica membrane shows a higher selectivity compared to the γ-alumina membrane, but the permeate flux is lower. At low ionic strength the electroviscous effect lowers the water flux through the γ-alumina membrane. The electroviscous effect is negligible for the organosilica membrane because its absolute surface potential ( 20 mV) is low compared to the γ-alumina membrane ( 60 mV). The simulation shows that the electroviscous effect should be included for the membranes with high surface potential (420 mV) and a pore size below 2–5 times of the electroviscous double layer thickness.

KW - METIS-309123

KW - IR-94182

U2 - 10.1016/j.memsci.2014.07.038

DO - 10.1016/j.memsci.2014.07.038

M3 - Article

VL - 470

SP - 307

EP - 315

JO - Journal of membrane science

JF - Journal of membrane science

SN - 0376-7388

ER -