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    Effective evaporation of CF4plasma modified PVDF membranes in direct contact membrane distillation

    Access Status
    Fulltext not available
    Authors
    Yang, C.
    Tian, M.
    Xie, Y.
    Li, X.
    Zhao, B.
    He, T.
    Liu, Jian
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Yang, C. and Tian, M. and Xie, Y. and Li, X. and Zhao, B. and He, T. and Liu, J. 2015. Effective evaporation of CF4plasma modified PVDF membranes in direct contact membrane distillation. Journal of Membrane Science. 482: pp. 25-32.
    Source Title
    Journal of Membrane Science
    DOI
    10.1016/j.memsci.2015.01.059
    ISSN
    0376-7388
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/72328
    Collection
    • Curtin Research Publications
    Abstract

    © 2015 Elsevier B.V. PVDF membranes, after surface modification by CF4plasma, have demonstrated surperhydrophobic surface characteristics and up to 30% flux enhancement in direct contact membrane distillation (MD). The heat transport in the MD process was modeled to assess the membrane distillation coefficients (Bm). The experimentally determined Bmshowed up to 50% deviation from the modeled values for CF4modified PVDF membranes. An effective evaporation factor, as a function of surface porosity and surface water contact angle, was proposed to correlate surface wettability contribution to the MD flux. This factor was fitted by comparing the experimentally determined flux with modeled one. It was found that the factor, which is positively related to surface water contact angle and surface porosity, varied with the membrane wettability and can rationally explain the deviation between observed and theoretical fluxes. In addition, CF4plasma modification could increase the membrane's evaporation efficiency from 54.3% for the virgin membrane up to 63.4% for surface modified membranes because of the increase of the effective evaporation area factor. The introduction of the factor provides a means to evaluate the membrane surface hydrophobicity to the MD flux and necessitate the development of super even ultra-hydrophobic membranes.

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