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    Enhanced forward osmosis from chemically modified polybenzimidazole (PBI) nanofiltration hollow fiber membranes with a thin wall

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    Type
    Article
    Authors
    Wang, Kai Yu
    Yang, Qian
    Chung, Tai-Shung
    Rajagopalan, Raj
    Date
    2009-04
    Permanent link to this record
    http://hdl.handle.net/10754/598179
    
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    Abstract
    To develop high-flux and high-rejection forward osmosis (FO) membranes for water reuses and seawater desalination, we have fabricated polybenzimidazole (PBI) nanofiltration (NF) hollow fiber membranes with a thin wall and a desired pore size via non-solvent induced phase inversion and chemically cross-linking modification. The cross-linking by p-xylylene dichloride can finely tune the mean pore size and enhance the salt selectivity. High water permeation flux and improved salt selectivity for water reuses were achieved by using the 2-h modified PBI NF membrane which has a narrow pore size distribution. Cross-linking at a longer time produces even a lower salt permeation flux potentially suitable for desalination but at the expense of permeation flux due to tightened pore sizes. It is found that draw solution concentration and membrane orientations are main factors determining the water permeation flux. In addition, effects of membrane morphology and operation conditions on water and salt transport through membrane have been investigated. © 2008 Elsevier Ltd. All rights reserved.
    Citation
    Wang KY, Yang Q, Chung T-S, Rajagopalan R (2009) Enhanced forward osmosis from chemically modified polybenzimidazole (PBI) nanofiltration hollow fiber membranes with a thin wall. Chemical Engineering Science 64: 1577–1584. Available: http://dx.doi.org/10.1016/j.ces.2008.12.032.
    Sponsors
    The authors would like to thank King Abdullah University of Science and Technology (KAUST), Saudi Arabia and National University of Singapore (NUS) for funding this research project with grant numbers of R-279-000-265-597 and R-279-000-265-598. Thanks are also due to the reviewers who provide valuable suggestion, scientific explanations and comments.
    Publisher
    Elsevier BV
    Journal
    Chemical Engineering Science
    DOI
    10.1016/j.ces.2008.12.032
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ces.2008.12.032
    Scopus Count
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