Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS)

To better understand organic solvent nanofiltration mechanisms, Electrical Impedance Spectroscopy was used to analyze real-time changes in the membrane, which functions as a variable dielectric and exhibits changes in capacitance as the solvent permeates. The 350 kDa membranes were composed of polyd...

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Main Authors: Ng, Angie Qi Qi, Tanudjaja, Henry Jonathan, Yeo, Ming Ming, Chew, Jia Wei
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/180005
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1800052024-09-09T07:10:54Z Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS) Ng, Angie Qi Qi Tanudjaja, Henry Jonathan Yeo, Ming Ming Chew, Jia Wei School of Chemical and Biomedical Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Engineering Organic solvent filtration Membrane-solvent interactions To better understand organic solvent nanofiltration mechanisms, Electrical Impedance Spectroscopy was used to analyze real-time changes in the membrane, which functions as a variable dielectric and exhibits changes in capacitance as the solvent permeates. The 350 kDa membranes were composed of polydimethylsiloxane active layers atop polyacrylonitrile supports, while the two solvents were ethanol and isopropyl alcohol (IPA). Four key differences between the solvents are revealed. Firstly, the flux decline was greater for ethanol because the higher polarity promoted adsorption. Secondly, during filtration, the conductance decreased for ethanol but increased for IPA. Thirdly, increasing pressure increased the membrane thickness for ethanol but not for IPA. Fourthly, the permeation mechanisms vary between the two solvents at different pressures. At the lower initial flux, flux decrease was due to extensive adsorption for ethanol, but to the accumulation of IPA impeding permeation for IPA. For the higher initial flux, the gentler flux decline for ethanol was due to greater membrane swelling, whereas the steeper decline for IPA was due to the high driving force promoting permeation through the DP layer to the membrane substrate. The results here underscore the importance of membrane-solvent interactions in affecting OSN performance. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Published version We acknowledge funding from the 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 Fund Tier 1 Grant (2019-T1- 002-065; RG100/19) and the Singapore Ministry of Education Academic Research Fund Tier 2 Grant (MOE-MOET2EP10120-0001). 2024-09-09T07:10:53Z 2024-09-09T07:10:53Z 2024 Journal Article Ng, A. Q. Q., Tanudjaja, H. J., Yeo, M. M. & Chew, J. W. (2024). Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS). Journal of Industrial and Engineering Chemistry, 136, 603-614. https://dx.doi.org/10.1016/j.jiec.2024.02.049 1226-086X https://hdl.handle.net/10356/180005 10.1016/j.jiec.2024.02.049 2-s2.0-85186684042 136 603 614 en A20B3a0070 A2083C0049 2019-T1-002-065 RG100/19 MOE-MOET2EP10120-0001 Journal of Industrial and Engineering Chemistry © 2024 The Author(s). Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Organic solvent filtration
Membrane-solvent interactions
spellingShingle Engineering
Organic solvent filtration
Membrane-solvent interactions
Ng, Angie Qi Qi
Tanudjaja, Henry Jonathan
Yeo, Ming Ming
Chew, Jia Wei
Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS)
description To better understand organic solvent nanofiltration mechanisms, Electrical Impedance Spectroscopy was used to analyze real-time changes in the membrane, which functions as a variable dielectric and exhibits changes in capacitance as the solvent permeates. The 350 kDa membranes were composed of polydimethylsiloxane active layers atop polyacrylonitrile supports, while the two solvents were ethanol and isopropyl alcohol (IPA). Four key differences between the solvents are revealed. Firstly, the flux decline was greater for ethanol because the higher polarity promoted adsorption. Secondly, during filtration, the conductance decreased for ethanol but increased for IPA. Thirdly, increasing pressure increased the membrane thickness for ethanol but not for IPA. Fourthly, the permeation mechanisms vary between the two solvents at different pressures. At the lower initial flux, flux decrease was due to extensive adsorption for ethanol, but to the accumulation of IPA impeding permeation for IPA. For the higher initial flux, the gentler flux decline for ethanol was due to greater membrane swelling, whereas the steeper decline for IPA was due to the high driving force promoting permeation through the DP layer to the membrane substrate. The results here underscore the importance of membrane-solvent interactions in affecting OSN performance.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Ng, Angie Qi Qi
Tanudjaja, Henry Jonathan
Yeo, Ming Ming
Chew, Jia Wei
format Article
author Ng, Angie Qi Qi
Tanudjaja, Henry Jonathan
Yeo, Ming Ming
Chew, Jia Wei
author_sort Ng, Angie Qi Qi
title Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS)
title_short Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS)
title_full Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS)
title_fullStr Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS)
title_full_unstemmed Understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (EIS)
title_sort understanding organic solvent permeation during nanofiltration via electrical impedance spectroscopy (eis)
publishDate 2024
url https://hdl.handle.net/10356/180005
_version_ 1814047206364151808