Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences

Nanofiltration (NF)-like membranes have shown potential for implementing forward osmosis (FO) for resource recovery. Despite the popular use of poly(allylamine hydrochloride) (PAH) as a polycation in the layer-by-layer (LbL) coating of NF-like membranes, it remained ambiguous whether substantial cha...

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Main Authors: Chen, Kai K., Li, Weiyi, Chew, Jia Wei
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/171428
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1714282023-10-24T07:08:28Z Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences Chen, Kai K. Li, Weiyi Chew, Jia Wei School of Chemical and Biomedical Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Engineering::Chemical engineering Polyvinylamine Membrane Fouling Nanofiltration (NF)-like membranes have shown potential for implementing forward osmosis (FO) for resource recovery. Despite the popular use of poly(allylamine hydrochloride) (PAH) as a polycation in the layer-by-layer (LbL) coating of NF-like membranes, it remained ambiguous whether substantial changes could result from the minor structural difference in polyamine when employing polyvinylamine (PVAm) as the polycation. This study systematically assessed the filtration capability of the NF-like membranes with varying combinations of the PAH- and PVAm-containing bilayers in an FO process. The FO experiments revealed that the dominance of PVAm-containing bilayers in the upper part of the active layer could result in decreases in both the water permeability and the rejection of divalent salts. Subsequent fouling tests demonstrated that the membrane coated solely with PVAm-containing bilayers (i.e., the VVV membrane) exhibited the fastest flux decline in the fouling tests with sodium alginate (SA), whereas the fouling layer could be more easily removed by the crossflow. Optical coherence tomography (OCT) characterization indicated that the bridging effect of divalent cations could promote the aggregation of SA to form a particulate layer more susceptible to the shear effect. All the results shed light on the improvement of NF-like FO by regulating the formation of the active layer via the LbL assembly. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) This study was supported by A*STAR (Singapore) Advanced Manufacturing and Engineering (AME) under its Pharma Innovation Programme Singapore (PIPS) program (A20B3a0070), A*STAR (Singapore) Advanced Manufacturing and Engineering (AME) under its Individual Research Grant (IRG) program (A2083c0049), the Singapore Ministry of Education Academic Research Tier 1 Grant (2019-T1-002-065; RG100/19) and the Singapore Ministry of Education Academic Research Tier 2 Grant (MOE-MOET2EP10120-0001), the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (2017ZT07Z479), and the Shenzhen Science and Technology Innovation Committee (JCYJ20190809172011680). 2023-10-24T07:08:28Z 2023-10-24T07:08:28Z 2023 Journal Article Chen, K. K., Li, W. & Chew, J. W. (2023). Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences. ACS ES&T Water, 3(7), 1902-1911. https://dx.doi.org/10.1021/acsestwater.2c00558 2690-0637 https://hdl.handle.net/10356/171428 10.1021/acsestwater.2c00558 2-s2.0-85166593103 7 3 1902 1911 en A20B3a0070 A2083c0049 2019-T1-002-065 RG100/19 MOE-MOET2EP10120-0001 ACS ES&T Water © 2023 American Chemical Society. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Chemical engineering
Polyvinylamine
Membrane Fouling
spellingShingle Engineering::Chemical engineering
Polyvinylamine
Membrane Fouling
Chen, Kai K.
Li, Weiyi
Chew, Jia Wei
Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences
description Nanofiltration (NF)-like membranes have shown potential for implementing forward osmosis (FO) for resource recovery. Despite the popular use of poly(allylamine hydrochloride) (PAH) as a polycation in the layer-by-layer (LbL) coating of NF-like membranes, it remained ambiguous whether substantial changes could result from the minor structural difference in polyamine when employing polyvinylamine (PVAm) as the polycation. This study systematically assessed the filtration capability of the NF-like membranes with varying combinations of the PAH- and PVAm-containing bilayers in an FO process. The FO experiments revealed that the dominance of PVAm-containing bilayers in the upper part of the active layer could result in decreases in both the water permeability and the rejection of divalent salts. Subsequent fouling tests demonstrated that the membrane coated solely with PVAm-containing bilayers (i.e., the VVV membrane) exhibited the fastest flux decline in the fouling tests with sodium alginate (SA), whereas the fouling layer could be more easily removed by the crossflow. Optical coherence tomography (OCT) characterization indicated that the bridging effect of divalent cations could promote the aggregation of SA to form a particulate layer more susceptible to the shear effect. All the results shed light on the improvement of NF-like FO by regulating the formation of the active layer via the LbL assembly.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Chen, Kai K.
Li, Weiyi
Chew, Jia Wei
format Article
author Chen, Kai K.
Li, Weiyi
Chew, Jia Wei
author_sort Chen, Kai K.
title Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences
title_short Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences
title_full Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences
title_fullStr Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences
title_full_unstemmed Unraveling distinct FO performance of NF-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences
title_sort unraveling distinct fo performance of nf-like membranes fabricated by deposition of bilayers containing polyamines with minor structural differences
publishDate 2023
url https://hdl.handle.net/10356/171428
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