Dual-layered nanocomposite substrate membrane based on polysulfone/graphene oxide for mitigating internal concentration polarization in forward osmosis

Publication Type:
Journal Article
Citation:
Polymer (United Kingdom), 2017, 110 pp. 36 - 48
Issue Date:
2017-02-10
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© 2016 Elsevier Ltd A novel thin-film composite (TFC) forward osmosis (FO) membrane with dual-layered substrate membrane was fabricated by a double-blade casting technique using different polysulfone (PSf) concentrations for top (15 wt%) and bottom (7 wt%) substrate layers. Graphene oxide (GO) was incorporated in the substrate layer, and the dual casting approach resulted in a membrane support with a highly porous bottom structure and a dense top skin layer on which the polyamide active layer was effectively formed. The dual-layered TFC PSf/GO membrane (TFC-PSf d GO) exhibited high water permeability, and ion selectivity was enhanced by the presence of well dispersed hydrophilic GO in the PSf substrate. The TFC-PSf d GO also exhibited the lowest specific reverse salt flux (J s /J v  = 0.19 g L -1 ) and a more favorable structural parameter (S = 130 μm) compared to GO-free membranes. Using deionized water as feed solution and 1 M NaCl as draw solution (DS), TFC-PSf d GO had J v  = 33.8 L m −2  h −1 and J s  = 6.9 g −2  h −1 under AL-FS mode, and J v  = 61.5 L m −2 h −1 and J s  = 14.0 g −2  h −1 under AL-DS mode. The potential of TFC-PSf d GO for commercial application was further evaluated by fabricating it with a fabric backing support (denoted as TFC-PSf d GO f ). Compared to TFC-PSf d GO, TFC-PSf d GO f exhibited only 14% decline in its water flux. The overall results reveal that, fabrication of TFC substrate membrane via dual-blade casting approach along with GO incorporation produced high-performance TFC FO membranes which likely reduced the internal concentration polarization effects.
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