Pressure retarded osmosis dual-layer hollow fiber membranes developed by co-casting method and ammonium persulfate (APS) treatment

Handle URI:
http://hdl.handle.net/10754/563812
Title:
Pressure retarded osmosis dual-layer hollow fiber membranes developed by co-casting method and ammonium persulfate (APS) treatment
Authors:
Fu, Fengjiang; Sun, Shipeng; Zhang, Sui; Chung, Neal Tai-Shung ( 0000-0003-3704-8609 )
Abstract:
Delamination and low water permeability are two issues limiting the applications of dual-layer hollow fiber membranes in the pressure retarded osmosis (PRO) process. In this work, we first developed a universal co-casting method that is able to co-cast highly viscous dope solutions to form homogeneous dual-layer flat sheet membranes. By employing this method prior to the tedious dual-layer hollow fiber spinning process, both time and material consumptions are significantly saved. The addition of polyvinylpyrrolidone (PVP) is found to eliminate delamination at the sacrifice of water flux. A new post-treatment method that involves flowing ammonium persulfate (APS) solution and DI water counter-currently is potentially to remove the PVP molecules entrapped in the substrate while keeps the integrity of the interface. As the APS concentration increases, the water flux in the PRO process is increased while the salt leakage is slightly decreased. With the optimized APS concentration of 5wt%, the post-treated membrane shows a maximum power density of 5.10W/m2 at a hydraulic pressure of 15.0bar when 1M NaCl and 10mM NaCl were used as the draw and feed solutions, respectively. To the extent of our knowledge, this is the best phase inversion dual-layer hollow fiber membrane with an outer selective layer for osmotic power generation. © 2014 Elsevier B.V.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
Issue Date:
Nov-2014
DOI:
10.1016/j.memsci.2014.05.063
Type:
Article
ISSN:
03767388
Sponsors:
This research was funded under the project entitled "Membrane development for osmotic power generation. Part 1. Materials development and membrane fabrication" (1102-IRIS-11-01) and NUS Grant no. R-279-000-381-279, This research grant is supported by the Singapore National Research Foundation under its Environmental & Water Technologies Strategic Research Programme and administered by the Environment & Water Industry Programme Office (EWI) of the PUB.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorFu, Fengjiangen
dc.contributor.authorSun, Shipengen
dc.contributor.authorZhang, Suien
dc.contributor.authorChung, Neal Tai-Shungen
dc.date.accessioned2015-08-03T12:11:00Zen
dc.date.available2015-08-03T12:11:00Zen
dc.date.issued2014-11en
dc.identifier.issn03767388en
dc.identifier.doi10.1016/j.memsci.2014.05.063en
dc.identifier.urihttp://hdl.handle.net/10754/563812en
dc.description.abstractDelamination and low water permeability are two issues limiting the applications of dual-layer hollow fiber membranes in the pressure retarded osmosis (PRO) process. In this work, we first developed a universal co-casting method that is able to co-cast highly viscous dope solutions to form homogeneous dual-layer flat sheet membranes. By employing this method prior to the tedious dual-layer hollow fiber spinning process, both time and material consumptions are significantly saved. The addition of polyvinylpyrrolidone (PVP) is found to eliminate delamination at the sacrifice of water flux. A new post-treatment method that involves flowing ammonium persulfate (APS) solution and DI water counter-currently is potentially to remove the PVP molecules entrapped in the substrate while keeps the integrity of the interface. As the APS concentration increases, the water flux in the PRO process is increased while the salt leakage is slightly decreased. With the optimized APS concentration of 5wt%, the post-treated membrane shows a maximum power density of 5.10W/m2 at a hydraulic pressure of 15.0bar when 1M NaCl and 10mM NaCl were used as the draw and feed solutions, respectively. To the extent of our knowledge, this is the best phase inversion dual-layer hollow fiber membrane with an outer selective layer for osmotic power generation. © 2014 Elsevier B.V.en
dc.description.sponsorshipThis research was funded under the project entitled "Membrane development for osmotic power generation. Part 1. Materials development and membrane fabrication" (1102-IRIS-11-01) and NUS Grant no. R-279-000-381-279, This research grant is supported by the Singapore National Research Foundation under its Environmental & Water Technologies Strategic Research Programme and administered by the Environment & Water Industry Programme Office (EWI) of the PUB.en
dc.publisherElsevier BVen
dc.subjectAmmonium persulfate (APS) post-treatmenten
dc.subjectCo-casting methoden
dc.subjectDual-layer hollow fiberen
dc.subjectPolybenzimidazole (PBI)en
dc.subjectPressure retarded osmosis (PRO)en
dc.titlePressure retarded osmosis dual-layer hollow fiber membranes developed by co-casting method and ammonium persulfate (APS) treatmenten
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalJournal of Membrane Scienceen
dc.contributor.institutionDepartment of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 119260, Singaporeen
dc.contributor.institutionNUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singaporeen
kaust.authorChung, Neal Tai-Shungen
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