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    Hierarchical Composite Membranes with Robust Omniphobic Surface Using Layer-By-Layer Assembly Technique

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    acs.est.7b05450.pdf
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    Type
    Article
    Authors
    Woo, Yun Chul
    Kim, Youngjin cc
    Yao, Minwei
    Tijing, Leonard Demegilio
    Choi, Juneseok
    Lee, Sangho
    Kim, Seunghyun
    Shon, Hokyong
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2018-02
    Online Publication Date
    2018-02
    Print Publication Date
    2018-02-20
    Permanent link to this record
    http://hdl.handle.net/10754/626864
    
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    Abstract
    In this study, composite membranes were fabricated via layer-by-layer (LBL) assembly of negatively-charged silica aerogel (SiA) and 1H, 1H, 2H, 2H – Perfluorodecyltriethoxysilane (FTCS) on a polyvinylidene fluoride phase inversion membrane, and interconnecting them with positively-charged poly(diallyldimethylammonium chloride) (PDDA) via electrostatic interaction. The results showed that the PDDA-SiA-FTCS coated membrane had significantly enhanced the membrane structure and properties. New trifluoromethyl and tetrafluoroethylene bonds appeared at the surface of the coated membrane, which led to lower surface free energy of the composite membrane. Additionally, the LBL membrane showed increased surface roughness. The improved structure and property gave the LBL membrane an omniphobic property, as indicated by its good wetting resistance. The membrane performed a stable air gap membrane distillation (AGMD) flux of 11.22 L/m2h with very high salt rejection using reverse osmosis brine from coal seam gas produced water as feed with the addition of up to 0.5 mM SDS solution. This performance was much better compared to those of the neat membrane. The present study suggests that the enhanced membrane properties with good omniphobicity via LBL assembly make the porous membranes suitable for long-term AGMD operation with stable permeation flux when treating challenging saline wastewater containing low surface tension organic contaminants.
    Citation
    Woo YC, Kim Y, Yao M, Tijing LD, Choi J, et al. (2018) Hierarchical Composite Membranes with Robust Omniphobic Surface Using Layer-By-Layer Assembly Technique. Environmental Science & Technology. Available: http://dx.doi.org/10.1021/acs.est.7b05450.
    Sponsors
    This research was supported by a grant (17IFIP-B065893-05) from the Industrial Facilities & Infrastructure Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government. The authors also acknowledge the grants from the ARC Future Fellowship (FT140101208) and 2017 FEIT Post Thesis Publication Scholarship by University of Technology Sydney (UTS).
    Publisher
    American Chemical Society (ACS)
    Journal
    Environmental Science & Technology
    DOI
    10.1021/acs.est.7b05450
    PubMed ID
    29338208
    Additional Links
    http://pubs.acs.org/doi/10.1021/acs.est.7b05450
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.est.7b05450
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC)

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