Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorFang, Wangxien
dc.contributor.authorShi, Leien
dc.contributor.authorWang, Rongen
dc.identifier.citationang, W., Shi, L., & Wang, R. (2014). Mixed polyamide-based composite nanofiltration hollow fiber membranes with improved low-pressure water softening capability. Journal of membrane science, 468, 52-61.en
dc.description.abstractMixed polyamide-based composite nanofiltration (NF) hollow fiber membranes with suitable characteristics for water softening under ultrafiltration (UF)-range low operating pressure were successfully developed. The thin-film selective layer of the composite membrane was formed via interfacial polymerization on the inner surface of a microporous polyethersulfone (PES) hollow fiber substrate with trymesoyl chloride (TMC) being the organic phase monomer, and a mixture of branched polyethyleneimine (PEI) and piperazine (PIP) being the monomers in the aqueous phase. In was found that there was a synergetic effect of PEI and PIP on the formation of the selective layer. The water permeability and salt rejection of the resultant membrane were both enhanced with a small amount of PIP added into the PEI aqueous phase, but dropped quickly with a higher PIP to PEI ratio. The optimized NF membrane possessed a molecular weight cut-off (MWCO) of 380 Da, an effective pore diameter of 1.27 nm, and pure water permeability (PWP) of 18.2 l/m2 h bar. Under an operating pressure of 2 bar, the membrane exhibited rejection of 96.3% and 93.8% to 1000 ppm MgCl2 and MgSO4 feed solutions, respectively. The capability of the newly developed membrane for low-pressure water softening was evaluated by employing simulated hard water feed solutions with different ionic compositions and total hardness. By the combining effect of electrostatic repulsion and size exclusion, the mixed PEI/PIP-based composite hollow fiber offered superior water softening performance compared with the membranes made with PEI or PIP alone as the aqueous phase IP monomer.en
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en
dc.description.sponsorshipEDB (Economic Devt. Board, S’pore)en
dc.format.extent25 p. + 15 p. figuresen
dc.relation.ispartofseriesJournal of membrane scienceen
dc.rights© 2014 Elsevier B. V. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Membrane Science. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].en
dc.subjectDRNTU::Engineering::Environmental engineering::Water treatmenten
dc.titleMixed polyamide-based composite nanofiltration hollow fiber membranes with improved low-pressure water softening capabilityen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen
dc.contributor.organizationSiemens Global R&D Centre (Water Technologies)en
dc.contributor.researchNanyang Environment and Water Research Instituteen
dc.contributor.researchSingapore Membrane Technology Centreen
dc.description.versionAccepted versionen
item.fulltextWith Fulltext-
Appears in Collections:CEE Journal Articles
NEWRI Journal Articles
Files in This Item:
File Description SizeFormat 
IP_softening_2_revised submission.pdfMain article260.27 kBAdobe PDFThumbnail
IP_softening_2_Figure_revised submission.pdfFigures1.43 MBAdobe PDFThumbnail

Citations 5

Updated on May 23, 2023

Web of ScienceTM
Citations 5

Updated on May 29, 2023

Page view(s) 20

Updated on Jun 2, 2023

Download(s) 5

Updated on Jun 2, 2023

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.