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Variation of free volume and thickness by high pressure applied on thin film composite reverse osmosis membrane

Authors
Chu, Kyoung HoonMang, Ji SungLim, JihunHong, SeungkwanHwang, Moon-Hyun
Issue Date
15-Dec-2021
Publisher
ELSEVIER
Keywords
Reverse osmosis (RO) membrane compaction; Positron annihilation lifetime spectroscopy; (PALS); Time-of-flight secondary ion mass spectrometry; (ToF-SIMS); Free volume; Thickness
Citation
DESALINATION, v.520
Indexed
SCIE
SCOPUS
Journal Title
DESALINATION
Volume
520
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/135419
DOI
10.1016/j.desal.2021.115365
ISSN
0011-9164
1873-4464
Abstract
Analytical technologies for polymeric membranes, including positron annihilation lifetime spectroscopy (PALS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS), were employed to understand the origin and harmful effects of thin film composite (TFC) reverse osmosis (RO) membrane compaction. Although no variation in water flux exceeding 10% from the initial flux was observed under all compaction pressures, the hydraulic pressure induced by the high-pressure pump caused a rapid contraction of the free volume and thickness of the TFC RO membrane. In particular, due to the viscoelastic polymer properties of the active layer, a reduction of approximately 15% free volume and 48% thickness was observed at a compaction pressure of 60 bar. Consequently, the analytical procedures can provide a better understanding of membrane compaction during pressurized membrane processes and strategic development to reduce the harmful effects of membrane compaction.
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