Polyamide thin-film composite membranes based on carboxylated polysulfone microporous support membranes for forward osmosis

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DOIResolve DOI: http://doi.org/10.1016/j.memsci.2013.06.003
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TypeArticle
Journal titleJournal of Membrane Science
ISSN0376-7388
Volume445
Pages220227; # of pages: 8
SubjectForward osmosis; Microporous Membrane; Desalination; Carboxylated Polysulfone
AbstractDue to its simple process and low energy consumption, forward osmosis (FO) has gained significant attention in the fields of portable hydration bags, desalination, landfill leachate treatment, and brine concentration. However, current state-of-the-art reverse osmosis (RO) membranes show relatively low water fluxes in FO processes due to high internal concentration polarization (ICP) and high mass transfer resistance in commercially available microporous support membranes. In this study, carboxylated polysulfones (CPSFs) were synthesized via direct polysulfone (PSF) functionalization and considered as hydrophilic, mechanically stable microporous support membranes. The incorporation of hydrophilic groups into hydrophobic polymer backbones often reduces mechanical strength due to excessive water swelling. However, the mechanical properties of CPSFs (degree of substitution, DS=0.49–0.85) were similar to those of pristine PSF, and they retained their hydrophilic nature. Microporous CPSF membranes were prepared in various conditions, and FO water fluxes and salt passages of polyamide thin-film/CPSF composite membranes were measured and compared with each other. CPSF-based FO membranes showed significantly higher water fluxes (water flux in FO mode: 18 L/m2 h, salt passage: 2.2 g/m2 h under 1 M MgCl2 as a draw solution, active layer facing DI water) than PSF-based FO membranes (10.5 L/m2 h, 1.5 g/m2 h at the same conditions), which might be due to enhanced hydrophilicity and reduced ICP.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NRC numberNRC-EME-53196
NPARC number21268965
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Record identifier97285ed8-bcce-4bdf-ae9a-e6b5f8af2814
Record created2013-11-28
Record modified2016-05-09
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