Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers

The layer-by-layer (LBL) polyelectrolyte deposition was applied on polyethersulfone (PES) hollow fiber ultrafiltration membrane to prepare nanofiltration (NF) membrane for low pressure water softening application for the first time. The effects of polyelectrolyte type and molecular weight (MW), depo...

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Main Authors: Rajabzadeh, Saeid, Liu, Chang, Shi, Lei, Wang, Rong
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2014
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Online Access:https://hdl.handle.net/10356/80043
http://hdl.handle.net/10220/19596
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-800432020-03-07T11:43:31Z Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers Rajabzadeh, Saeid Liu, Chang Shi, Lei Wang, Rong School of Civil and Environmental Engineering Singapore Membrane Technology Centre DRNTU::Engineering::Environmental engineering::Water treatment The layer-by-layer (LBL) polyelectrolyte deposition was applied on polyethersulfone (PES) hollow fiber ultrafiltration membrane to prepare nanofiltration (NF) membrane for low pressure water softening application for the first time. The effects of polyelectrolyte type and molecular weight (MW), deposited bilayer number, polyelectrolyte solution pH and supporting electrolyte concentration on the performance of resultant membranes were studied thoroughly. Experiments revealed that the pH of the polyelectrolyte solution and supporting electrolyte concentration presented the most notable effects. For weak poly-cations, Poly(ethylenimine) (PEI) and Poly(allylamine hydrochloride) (PAH), the solution pH affected the membrane performance significantly, and high water permeability and divalent cation rejection were obtained at optimum pH values. Using a low concentration of supporting electrolyte at underneath layers was proved to be an effective way to increase water permeability while maintaining high salt rejection. A salt water flux (SWP) of 12 LMH/bar and 94% Mg2 + rejection was obtained by depositing only two bilayers of PSS/PAH polyelectrolytes on the PES substrate, while for the 3000 ppm mixed salt solution, the water permeability was 11 LMH/bar with Mg2 + and Ca2 + rejection as high as 90%. These promising results demonstrate that LBL technique is potentially applicable for preparing low-pressure water softening hollow fiber membranes. NRF (Natl Research Foundation, S’pore) EDB (Economic Devt. Board, S’pore) Accepted version 2014-06-10T02:13:07Z 2019-12-06T13:39:20Z 2014-06-10T02:13:07Z 2019-12-06T13:39:20Z 2014 2014 Journal Article Rajabzadeh, S., Liu, C., Shi, L., & Wang, R. (2014). Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers. Desalination, 344, 64-70. 0011-9164 https://hdl.handle.net/10356/80043 http://hdl.handle.net/10220/19596 10.1016/j.desal.2014.03.013 en Desalination © 2014 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Desalination, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.desal.2014.03.013]. application/pdf application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water treatment
spellingShingle DRNTU::Engineering::Environmental engineering::Water treatment
Rajabzadeh, Saeid
Liu, Chang
Shi, Lei
Wang, Rong
Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers
description The layer-by-layer (LBL) polyelectrolyte deposition was applied on polyethersulfone (PES) hollow fiber ultrafiltration membrane to prepare nanofiltration (NF) membrane for low pressure water softening application for the first time. The effects of polyelectrolyte type and molecular weight (MW), deposited bilayer number, polyelectrolyte solution pH and supporting electrolyte concentration on the performance of resultant membranes were studied thoroughly. Experiments revealed that the pH of the polyelectrolyte solution and supporting electrolyte concentration presented the most notable effects. For weak poly-cations, Poly(ethylenimine) (PEI) and Poly(allylamine hydrochloride) (PAH), the solution pH affected the membrane performance significantly, and high water permeability and divalent cation rejection were obtained at optimum pH values. Using a low concentration of supporting electrolyte at underneath layers was proved to be an effective way to increase water permeability while maintaining high salt rejection. A salt water flux (SWP) of 12 LMH/bar and 94% Mg2 + rejection was obtained by depositing only two bilayers of PSS/PAH polyelectrolytes on the PES substrate, while for the 3000 ppm mixed salt solution, the water permeability was 11 LMH/bar with Mg2 + and Ca2 + rejection as high as 90%. These promising results demonstrate that LBL technique is potentially applicable for preparing low-pressure water softening hollow fiber membranes.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Rajabzadeh, Saeid
Liu, Chang
Shi, Lei
Wang, Rong
format Article
author Rajabzadeh, Saeid
Liu, Chang
Shi, Lei
Wang, Rong
author_sort Rajabzadeh, Saeid
title Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers
title_short Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers
title_full Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers
title_fullStr Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers
title_full_unstemmed Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers
title_sort preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers
publishDate 2014
url https://hdl.handle.net/10356/80043
http://hdl.handle.net/10220/19596
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