Omniphobic desalination membranes: Effective deposition of zinc oxide nanoparticles

L.-H. Chen, A. Huang, Y.-R. Chen, K.-L. Tung*, National Taiwan University, Taiwan

An omniphobic membrane was fabricated for membrane distillation (MD) by effectively depositing ZnO nanoparticles on a hydrophilic glass fiber (GF) membrane to create hierarchical re-entrant structures, followed by surface fluorination and the addition of a polymer coating to lower the surface energy of the membrane. The omniphobic membranes possessed a particulate membrane morphology and an extremely high fluorine concentration on the surface. The omniphobicity of the fabricated membrane was indicated by the contact angles for water and ethanol, which were as high as 152.8±1.1° and 110.3±1.9°, respectively. Compared to superhydrophobic GF membranes without deposited ZnO nanoparticles, the omniphobic membrane revealed a higher wetting resistance to low surface tension feed solutions during DCMD experiments, and the initial water flux was maintained after the addition of 0.3 mM sodium dodecyl sulfate to a 60°C 1 M NaCl solution, which corresponded to a feed surface tension as low as 31 mN/m. The results suggest that ...

Session: M2 - New Membranes II
Day: 14 March 2018
Time: 10:45 - 12:00 h

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