Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications

The layer-by-layer (LBL) polyelectrolyte deposited membranes have drawn increasing attention in various applications due to the ease of selective layer formation and their stability and versatility. In this study, the LBL deposition was performed at the inner surface of the polyethersulfone (PES) ho...

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Main Authors: 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/10356/79613
http://hdl.handle.net/10220/20938
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-796132020-09-26T22:00:15Z Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications Liu, Chang Shi, Lei Wang, Rong School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre DRNTU::Engineering::Environmental engineering::Water treatment The layer-by-layer (LBL) polyelectrolyte deposited membranes have drawn increasing attention in various applications due to the ease of selective layer formation and their stability and versatility. In this study, the LBL deposition was performed at the inner surface of the polyethersulfone (PES) hollow fiber substrate to form composite nanofiltration (NF) membrane. The semi-dynamic deposition procedure was adopted with the aid of syringes. The newly developed inner deposited (id-LBL) membranes were then tested in NF and forward osmosis (FO) applications and the performance were compared with outer surface deposition as well as some literature data. The id-LBL membranes could not only withstand higher operating pressure but also possess superior hardness rejection especially in high concentration mixed salt solutions (more than 95% rejection to Mg2+ and Ca2+ in a 5000 ppm total dissolved salt (TDS) mixture under 4.8 bar). As for the FO process, with only two layer deposition, the id-LBL membranes also demonstrated significant performance improvement with increased water flux (up to 70 L/m2 h using 0.5 M MgCl2 as draw solution in active layer facing draw solution configuration) and reduced salt leakage (around 0.5 g/m2 h using 1 M MgCl2 draw solution in active layer facing feed water configuration). This study suggests that for hollow fiber substrate, the inner surface is more suitable for the formation of the selective layer via LBL deposition than the outer surface. NRF (Natl Research Foundation, S’pore) EDB (Economic Devt. Board, S’pore) Accepted version 2014-09-22T07:11:04Z 2019-12-06T13:29:22Z 2014-09-22T07:11:04Z 2019-12-06T13:29:22Z 2014 2014 Journal Article Liu, C., Shi, L.,& Wang, R. (2014). Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications. Reactive and functional polymers. 1381-5148 https://hdl.handle.net/10356/79613 http://hdl.handle.net/10220/20938 10.1016/j.reactfunctpolym.2014.07.018 en Reactive and functional polymers © 2014 Elsevier B. V. This is the author created version of a work that has been peer reviewed and accepted for publication by Reactive and Functional Polymers. 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.reactfunctpolym.2014.07.018]. 14 p. + 12 p. figures 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
Liu, Chang
Shi, Lei
Wang, Rong
Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications
description The layer-by-layer (LBL) polyelectrolyte deposited membranes have drawn increasing attention in various applications due to the ease of selective layer formation and their stability and versatility. In this study, the LBL deposition was performed at the inner surface of the polyethersulfone (PES) hollow fiber substrate to form composite nanofiltration (NF) membrane. The semi-dynamic deposition procedure was adopted with the aid of syringes. The newly developed inner deposited (id-LBL) membranes were then tested in NF and forward osmosis (FO) applications and the performance were compared with outer surface deposition as well as some literature data. The id-LBL membranes could not only withstand higher operating pressure but also possess superior hardness rejection especially in high concentration mixed salt solutions (more than 95% rejection to Mg2+ and Ca2+ in a 5000 ppm total dissolved salt (TDS) mixture under 4.8 bar). As for the FO process, with only two layer deposition, the id-LBL membranes also demonstrated significant performance improvement with increased water flux (up to 70 L/m2 h using 0.5 M MgCl2 as draw solution in active layer facing draw solution configuration) and reduced salt leakage (around 0.5 g/m2 h using 1 M MgCl2 draw solution in active layer facing feed water configuration). This study suggests that for hollow fiber substrate, the inner surface is more suitable for the formation of the selective layer via LBL deposition than the outer surface.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Liu, Chang
Shi, Lei
Wang, Rong
format Article
author Liu, Chang
Shi, Lei
Wang, Rong
author_sort Liu, Chang
title Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications
title_short Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications
title_full Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications
title_fullStr Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications
title_full_unstemmed Enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications
title_sort enhanced hollow fiber membrane performance via semi-dynamic layer-by-layer polyelectrolyte inner surface deposition for nanofiltration and forward osmosis applications
publishDate 2014
url https://hdl.handle.net/10356/79613
http://hdl.handle.net/10220/20938
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