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    Tri-bore PVDF hollow fibers with a super-hydrophobic coating for membrane distillation

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    Type
    Article
    Authors
    Lu, Kang-Jia
    Zuo, Jian
    Chung, Tai-Shung
    KAUST Department
    Water Desalination & Reuse Research Cntr
    Date
    2016-04-27
    Online Publication Date
    2016-04-27
    Print Publication Date
    2016-09
    Permanent link to this record
    http://hdl.handle.net/10754/608643
    
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    Abstract
    Membranes with good mechanical strength, high vapor flux and outstanding anti-wetting properties are essential for membrane distillation (MD) applications. In this work, porous polyvinylidene fluoride (PVDF) tri-bore hollow fiber membranes with super-hydrophobicity are developed to achieve these desired properties. The tri-bore hollow fiber offers better mechanical strength than the conventional single-bore fiber. To improve its anti-wetting properties, Teflon® AF 2400 is coated on the membrane surface. The effects of coating on membrane morphology, performance and anti-wetting properties have been thoroughly investigated. With an optimal coating condition (0.025 wt% of Teflon® AF 2400, 30 s), a super-hydrophobic surface with a contact angle of 151o is achieved. The resultant membrane shows an increase of 109% in liquid entry pressure (LEP) with a slight sacrifice of 21% in flux. Long term direct contact MD tests have confirmed that the Teflon® AF 2400 coated membrane has enhanced stability with an average flux of 21 kg m-2 h-1 and rejection of 99.99% at 60 °° C for desalination application.
    Citation
    Tri-bore PVDF hollow fibers with a super-hydrophobic coating for membrane distillation 2016 Journal of Membrane Science
    Sponsors
    The authors would like to thank Singapore National Research Foundation under its Energy Innovation Research Programme for supporting the project entitled, “Using Cold Energy from Re-gasification of Liquefied Natural Gas (LNG) for Novel Hybrid Seawater Desalination Technologies” (Grant number: R-279-000-456-279). Miss Kangjia Lu would also like to thank Dr. Peng Wang and Miss Dan Hua for their valuable advices and kind support.
    Publisher
    Elsevier BV
    Journal
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2016.04.058
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0376738816302952
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.memsci.2016.04.058
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