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    Surface modification of thin-film composite forward osmosis membranes with polyvinyl alcohol–graphene oxide composite hydrogels for antifouling properties

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    Type
    Article
    Authors
    Akther, Nawshad
    Ali, Syed Muztuza
    Phuntsho, Sherub
    Shon, Hokyong
    KAUST Grant Number
    CRG2017
    URF/1/3404-01
    Date
    2020-10
    Embargo End Date
    2022-06-13
    Permanent link to this record
    http://hdl.handle.net/10754/667364
    
    Metadata
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    Abstract
    In this study, the polyamide (PA) layers of commercial thin-film composite (TFC) forward osmosis (FO) membranes were coated with glutaraldehyde cross-linked polyvinyl alcohol (PVA) hydrogel comprising of graphene oxide (GO) at various loadings to enhance their fouling resistance. The optimal GO concentration of 0.02 wt% in hydrogel solution was confirmed from the FO membrane performance, and its influence on membrane antifouling properties was studied. The properties of the modified membranes, such as surface morphology, surface charge and wettability, were also investigated. PVA/GO coating was observed to increase the smoothness and hydrophilicity of the membrane surface. The foulant resistances of the pristine, PVA-coated and PVA/GO-coated membranes were also reported. PVA hydrogel-coated TFC membrane with a GO loading of 0.02 wt% showed a 55% reduction in specific reverse solute flux, only a marginal reduction in the water flux, and the best antifouling property with a 58% higher flux recovery than the pristine TFC membrane. The significant improvement in the selectivity of the modified membranes meant that the hydrogel coating could be used to seal PA defects. The biocidal GO flakes in PVA hydrogel coating also improved the biofouling resistance of the modified membranes, which could be attributed to their morphologies and superior surface properties.
    Citation
    Akther, N., Ali, S. M., Phuntsho, S., & Shon, H. (2020). Surface modification of thin-film composite forward osmosis membranes with polyvinyl alcohol–graphene oxide composite hydrogels for antifouling properties. Desalination, 491, 114591. doi:10.1016/j.desal.2020.114591
    Sponsors
    The research reported in this paper was supported by the ARC Industrial Transformation Research Hub (IH170100009) and the King Abdullah University of Science and Technology (KAUST), Saudi Arabia through the Competitive Research Grant Program – CRG2017 (CRG6), Grant # URF/1/3404-01.
    Publisher
    Elsevier BV
    Journal
    Desalination
    DOI
    10.1016/j.desal.2020.114591
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0011916420308602
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.desal.2020.114591
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