Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/161963
Title: Dissecting the structure-compaction-performance relationship of thin-film composite polyamide membranes with different structure features
Authors: Zhao, Yali
Lai, Gwo Sung
Chong, Jeng Yi
Wang, Rong
Keywords: Engineering::Environmental engineering
Issue Date: 2022
Source: Zhao, Y., Lai, G. S., Chong, J. Y. & Wang, R. (2022). Dissecting the structure-compaction-performance relationship of thin-film composite polyamide membranes with different structure features. Journal of Membrane Science, 654, 120553-. https://dx.doi.org/10.1016/j.memsci.2022.120553
Project: PUB-1801-0010 
Journal: Journal of Membrane Science
Abstract: Thin film composite (TFC) polyamide (PA) membranes experience compaction at high pressure applications, resulting in the reduction in water permeability. However, the compaction mechanism is still unclear especially for different PA morphologies and substrate structures. In this work, we systematically studied the compaction of TFC PA membranes with different structures and morphologies. We first examined 2 main types of commercial reverse osmosis (RO) membranes: brackish water RO and seawater RO membranes. After that, we synthesised four types of TFC membranes with tailored PA and substrate structures to further understand the compaction behaviors. TFC membrane with a PA layer of low protuberances or nodules and dense substrate showed excellent resistance against high pressure (50 bar), with only a slight irreversible decrease of 2.1–3.5% in water permeability when retested at 5 bar. However, the PA layer of high protuberances experienced significant compaction even when it was supported by a similar dense substrate. The permeability of the TFC membrane decreased ∼10% as a result of the decrease in the effective area of the active layer. On the other hand, the TFC membrane with a PA layer of low protuberances formed atop a loose substrate showed a greater decrease (∼18.5%) in water permeability. The densified skin layer and collapsed macro-voids within the loose substrate resulted in a ∼40% decrease in the overall height of the PA layer and a 65% decline in substrate surface porosity, respectively, which are identified as the reasons for the reducing water permeability. Notably, the water-salt selectivity of this particular membrane was seriously deteriorated after compaction due to the presence of subtle defects in the PA layer caused by the drastic deformation of the loose substrate. This work deepens the understanding of the compaction behaviors of TFC PA membranes, providing a clear fundamental guidance on designing membranes applied at high operating pressures.
URI: https://hdl.handle.net/10356/161963
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2022.120553
Rights: © 2022 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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