Characterization and retention of NF membranes using PEG, HS and polyelectrolytes

Nidal Hilal, Mohammed Al-Abri, Hilal Al-Hinai, Mousa Abu-Arabi

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Nanofiltration (NF) membranes retention depends on charge repulsion and size exclusion, combining the properties of ultrafiltration and reverse osmosis membranes. The molecular weight cut-off of two NF membranes was determined using cross-flow filtration of different molecular weights of non-ionized polyethylene glycol (PEG). Their retention of humic acid (HA), fulvic acid (FA), diallyldimethylammonium chloride and copolymer of dimethyl aminoethyl acrylate was also determined. NF270 membrane's pure water flux was higher than NF90. NF270 also produced lower retention compared to NF90. Observed retention of PEG using NF270 was lower than NF90, but real retention of PEG was higher for NF270 than NF90. This unexpected result is due to the inconsistency of the concentration polarization model. According to the concentration polarization model, real retention determination is dependent on permeate flux (Jv) instead of taking account of membrane flux reduction. The two membranes are supposed to operate at similar flux to overcome this inconsistency. Incomplete retention of poly diallyldimethylammonium chloride (PDADMAC) and copolymer of dimethyl aminoethyl acrylate (CoAA) is due to the presence of their monomers. HA retention is higher than FA because of its higher molecular weight range. NF270 membrane retention of HA and FA is lower than NF90 because of its higher pore size and porosity. Solute retention is constant with increasing pressure due to the competition between concentration polarization and dilution effects at the studied range of trans-membrane pressure (TMP).

Original languageEnglish
Pages (from-to)284-293
Number of pages10
JournalDesalination
Volume221
Issue number1-3
DOIs
Publication statusPublished - 1 Mar 2008
Externally publishedYes

Fingerprint

Nanofiltration membranes
Polyelectrolytes
Polyethylene glycols
Humic Substances
membrane
Membranes
Fluxes
Molecular weight
Polarization
Acids
fulvic acid
Copolymers
humic acid
Osmosis membranes
polarization
Reverse osmosis
Ultrafiltration
Dilution
Pore size
Porosity

Keywords

  • Characterization
  • Cross-flow filtration
  • Humic substances
  • Nanofiltration
  • Polyelectrolytes

ASJC Scopus subject areas

  • Filtration and Separation

Cite this

Characterization and retention of NF membranes using PEG, HS and polyelectrolytes. / Hilal, Nidal; Al-Abri, Mohammed; Al-Hinai, Hilal; Abu-Arabi, Mousa.

In: Desalination, Vol. 221, No. 1-3, 01.03.2008, p. 284-293.

Research output: Contribution to journalArticle

Hilal, N, Al-Abri, M, Al-Hinai, H & Abu-Arabi, M 2008, 'Characterization and retention of NF membranes using PEG, HS and polyelectrolytes', Desalination, vol. 221, no. 1-3, pp. 284-293. https://doi.org/10.1016/j.desal.2007.01.085
Hilal, Nidal ; Al-Abri, Mohammed ; Al-Hinai, Hilal ; Abu-Arabi, Mousa. / Characterization and retention of NF membranes using PEG, HS and polyelectrolytes. In: Desalination. 2008 ; Vol. 221, No. 1-3. pp. 284-293.
@article{164412ea8f624c0ca213dbca67484c63,
title = "Characterization and retention of NF membranes using PEG, HS and polyelectrolytes",
abstract = "Nanofiltration (NF) membranes retention depends on charge repulsion and size exclusion, combining the properties of ultrafiltration and reverse osmosis membranes. The molecular weight cut-off of two NF membranes was determined using cross-flow filtration of different molecular weights of non-ionized polyethylene glycol (PEG). Their retention of humic acid (HA), fulvic acid (FA), diallyldimethylammonium chloride and copolymer of dimethyl aminoethyl acrylate was also determined. NF270 membrane's pure water flux was higher than NF90. NF270 also produced lower retention compared to NF90. Observed retention of PEG using NF270 was lower than NF90, but real retention of PEG was higher for NF270 than NF90. This unexpected result is due to the inconsistency of the concentration polarization model. According to the concentration polarization model, real retention determination is dependent on permeate flux (Jv) instead of taking account of membrane flux reduction. The two membranes are supposed to operate at similar flux to overcome this inconsistency. Incomplete retention of poly diallyldimethylammonium chloride (PDADMAC) and copolymer of dimethyl aminoethyl acrylate (CoAA) is due to the presence of their monomers. HA retention is higher than FA because of its higher molecular weight range. NF270 membrane retention of HA and FA is lower than NF90 because of its higher pore size and porosity. Solute retention is constant with increasing pressure due to the competition between concentration polarization and dilution effects at the studied range of trans-membrane pressure (TMP).",
keywords = "Characterization, Cross-flow filtration, Humic substances, Nanofiltration, Polyelectrolytes",
author = "Nidal Hilal and Mohammed Al-Abri and Hilal Al-Hinai and Mousa Abu-Arabi",
year = "2008",
month = "3",
day = "1",
doi = "10.1016/j.desal.2007.01.085",
language = "English",
volume = "221",
pages = "284--293",
journal = "Desalination",
issn = "0011-9164",
publisher = "Elsevier",
number = "1-3",

}

TY - JOUR

T1 - Characterization and retention of NF membranes using PEG, HS and polyelectrolytes

AU - Hilal, Nidal

AU - Al-Abri, Mohammed

AU - Al-Hinai, Hilal

AU - Abu-Arabi, Mousa

PY - 2008/3/1

Y1 - 2008/3/1

N2 - Nanofiltration (NF) membranes retention depends on charge repulsion and size exclusion, combining the properties of ultrafiltration and reverse osmosis membranes. The molecular weight cut-off of two NF membranes was determined using cross-flow filtration of different molecular weights of non-ionized polyethylene glycol (PEG). Their retention of humic acid (HA), fulvic acid (FA), diallyldimethylammonium chloride and copolymer of dimethyl aminoethyl acrylate was also determined. NF270 membrane's pure water flux was higher than NF90. NF270 also produced lower retention compared to NF90. Observed retention of PEG using NF270 was lower than NF90, but real retention of PEG was higher for NF270 than NF90. This unexpected result is due to the inconsistency of the concentration polarization model. According to the concentration polarization model, real retention determination is dependent on permeate flux (Jv) instead of taking account of membrane flux reduction. The two membranes are supposed to operate at similar flux to overcome this inconsistency. Incomplete retention of poly diallyldimethylammonium chloride (PDADMAC) and copolymer of dimethyl aminoethyl acrylate (CoAA) is due to the presence of their monomers. HA retention is higher than FA because of its higher molecular weight range. NF270 membrane retention of HA and FA is lower than NF90 because of its higher pore size and porosity. Solute retention is constant with increasing pressure due to the competition between concentration polarization and dilution effects at the studied range of trans-membrane pressure (TMP).

AB - Nanofiltration (NF) membranes retention depends on charge repulsion and size exclusion, combining the properties of ultrafiltration and reverse osmosis membranes. The molecular weight cut-off of two NF membranes was determined using cross-flow filtration of different molecular weights of non-ionized polyethylene glycol (PEG). Their retention of humic acid (HA), fulvic acid (FA), diallyldimethylammonium chloride and copolymer of dimethyl aminoethyl acrylate was also determined. NF270 membrane's pure water flux was higher than NF90. NF270 also produced lower retention compared to NF90. Observed retention of PEG using NF270 was lower than NF90, but real retention of PEG was higher for NF270 than NF90. This unexpected result is due to the inconsistency of the concentration polarization model. According to the concentration polarization model, real retention determination is dependent on permeate flux (Jv) instead of taking account of membrane flux reduction. The two membranes are supposed to operate at similar flux to overcome this inconsistency. Incomplete retention of poly diallyldimethylammonium chloride (PDADMAC) and copolymer of dimethyl aminoethyl acrylate (CoAA) is due to the presence of their monomers. HA retention is higher than FA because of its higher molecular weight range. NF270 membrane retention of HA and FA is lower than NF90 because of its higher pore size and porosity. Solute retention is constant with increasing pressure due to the competition between concentration polarization and dilution effects at the studied range of trans-membrane pressure (TMP).

KW - Characterization

KW - Cross-flow filtration

KW - Humic substances

KW - Nanofiltration

KW - Polyelectrolytes

UR - http://www.scopus.com/inward/record.url?scp=38349169071&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38349169071&partnerID=8YFLogxK

U2 - 10.1016/j.desal.2007.01.085

DO - 10.1016/j.desal.2007.01.085

M3 - Article

AN - SCOPUS:38349169071

VL - 221

SP - 284

EP - 293

JO - Desalination

JF - Desalination

SN - 0011-9164

IS - 1-3

ER -