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    Water flux enhancement of PVDF membrane by a facile coating method for vacuum membrane distillation

    Year: 2022

    Journal: Desalination, Volume 536, AUG 15

    Authors: Li, Zhan; Zhang, Pengfei; Guan, Kecheng; Yoshioka, Tomohisa; Matsuyama, Hideto

    Organizations: New Energy and Industrial Technology Development Organization (NEDO) [JPNP18016]

    Keywords: Polyvinylidene difluoride; Hollow fiber membrane; Membrane modification; Ionic liquid; Vacuum membrane distillation

    Vacuum membrane distillation (VMD) has received considerable attention from both academia and industry. During VMD, the liquid-vapor interface is supported by a porous hydrophobic membrane to prevent wetting of the membrane pores and allow only vapor to pass through. Therefore, it is advantageous for the production of high-purity water by desalination, and improving the membrane performance has attracted significant attention. In this work, we present a facile method of modifying polyvinylidene difluoride (PVDF) membranes with a fluorine-containing ionic liquid (BPPF6) to improve the membrane hydrophobicity and antiwetting and antifouling properties. The dynamic water contact angle of the membrane increased from 124.5 +/- 0.3 degrees to 136.7 +/- 0.1 degrees, and the VMD water flux increased by 14.2% for treating 3.5 wt% NaCl aqueous solution at 45 degrees C.
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