Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/163514
Title: A scalable method to fabricate high-performance biomimetic membranes for seawater desalination: incorporating pillar[5]arene water nanochannels into the polyamide selective layer
Authors: Lim, Yu Jie
Lai, Gwo Sung
Zhao, Yali
Ma, Yunqiao
Torres, Jaume
Wang, Rong
Keywords: Engineering::Environmental engineering
Issue Date: 2022
Source: Lim, Y. J., Lai, G. S., Zhao, Y., Ma, Y., Torres, J. & Wang, R. (2022). A scalable method to fabricate high-performance biomimetic membranes for seawater desalination: incorporating pillar[5]arene water nanochannels into the polyamide selective layer. Journal of Membrane Science, 661, 120957-. https://dx.doi.org/10.1016/j.memsci.2022.120957
Project: PUB-1800-0010
Journal: Journal of Membrane Science
Abstract: In this work, we explored the practicability of a nanochannel-based biomimetic membrane (NBM) incorporating pillar[5]arene water channels for seawater reverse osmosis (SWRO) desalination. Two classes of peptide-attached biomimetic channels, (pR)-pillar[5]arenes (pRPH) and (pS)-pillar[5]arenes (pSPH) were integrated into the selective layer of SWRO membranes via interfacial polymerization on the top side of a polysulfone (PSf) support membrane. Here, pSPH is a non-identical stereoisomer of pRPH and was used as a negative control to pRPH to elucidate the flux enhancement effect contributed by pRPH. The optimized NBM presented a water permeability of 2.52 L m-2 h-1 bar-1 and 99.5% rejection under SWRO testing conditions of 50 bar applied pressure and 32,000 mg/L NaCl as feed solution. The 62% permeability increment with reference to the control membrane is hypothesized to originate from hybrid polyamide layers that were rougher with more voids (higher effective surface area and lower hydraulic resistance for water transport) as well as the conceivable water transport pathways provided by the pRPH channels. The simulation results from module-scale modelling suggest that the optimized NBM could lead to 7.2% savings in specific energy consumption of the membrane unit stage (or reduce the required membrane area by 25%) with respect to the commercial SWC4-LD membrane. The performance of the optimized NBM was further assessed in a one-week desalination test using an actual seawater feed gathered from an SWRO plant in Singapore. The robust NBM exhibited stable performance and ∼28% higher water flux (42 L m-2 h-1) than SWC4-LD with a comparable rejection of 99.3%, suggesting the feasibility of pillar[5]arene-based biomimetic membranes for seawater desalination.
URI: https://hdl.handle.net/10356/163514
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2022.120957
Schools: School of Civil and Environmental Engineering 
Interdisciplinary Graduate School (IGS) 
School of Chemical and Biomedical Engineering 
School of Biological Sciences 
Research Centres: Nanyang Environment and Water Research Institute 
Singapore Membrane Technology Centre 
Rights: © 2022 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles
IGS Journal Articles
NEWRI Journal Articles
SBS Journal Articles
SCBE Journal Articles

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