Journal
DESALINATION
Volume 336, Issue -, Pages 24-31Publisher
ELSEVIER
DOI: 10.1016/j.desal.2013.12.031
Keywords
Forward osmosis; Internal concentration polarization; Nanofiber; Polyvinyl alcohol; Nanofiber thin film composite
Categories
Funding
- Basic Science Research Program [2012-0001932]
- Priority Research Centers Program through the National Research Foundation of Korea (NRF) [2012-0006693]
- Ministry of Education Science and Technology, Republic of Korea
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Recent developments on osmotically driven membrane processes (ODMPs), e.g. forward osmosis (FO) and pressure retarded osmosis (PRO), suggest a high viability for clean water and energy production. However, membranes used in these processes encounter high internal concentration polarization (ICP), inherent to osmotically driven membranes, which keeps them from delivering optimum performance in terms of water flux. In this study, a nanofiber thin film composite (NTFC) membrane was synthesized. Crosslinked electrospun polyvinyl alcohol (PVA) nanofiber was uniquely found to be a very effective support layer, specifically for FO applications, due to its very low tortuosity, very high porosity and remarkable hydrophilic property. The successfully fabricated composite exhibited a 7-8 times improved FO water flux as compared to a commercially available FO membrane. Ultimately, our membrane displayed a lower structural parameter (S = 66 +/- 7.9), a measure of ICP condition, compared to previously synthesized NTFC membranes. Based on the performance of our membrane, this hydrophilic nanofiber supported membrane, with further development, has the high potential to be the next-generation FO membrane. (C) 2014 Elsevier BM. All rights reserved.
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