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dc.contributor.authorFu, Fengjiang
dc.contributor.authorSun, Shipeng
dc.contributor.authorZhang, Sui
dc.contributor.authorChung, Neal Tai-Shung
dc.date.accessioned2015-08-03T12:11:00Z
dc.date.available2015-08-03T12:11:00Z
dc.date.issued2014-11
dc.identifier.issn03767388
dc.identifier.doi10.1016/j.memsci.2014.05.063
dc.identifier.urihttp://hdl.handle.net/10754/563812
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.
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.
dc.publisherElsevier BV
dc.subjectAmmonium persulfate (APS) post-treatment
dc.subjectCo-casting method
dc.subjectDual-layer hollow fiber
dc.subjectPolybenzimidazole (PBI)
dc.subjectPressure retarded osmosis (PRO)
dc.titlePressure retarded osmosis dual-layer hollow fiber membranes developed by co-casting method and ammonium persulfate (APS) treatment
dc.typeArticle
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalJournal of Membrane Science
dc.contributor.institutionDepartment of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 119260, Singapore
dc.contributor.institutionNUS Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, #02-01, Singapore 117411, Singapore
kaust.personChung, Neal Tai-Shung


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