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http://dx.doi.org/10.15681/KSWE.2022.38.3.143

Hydrophilic/Hydrophobic Dual Surface Coatings for Membrane Distillation Desalination  

Kim, Hye-Won (Water Cycle Research Center, Korea Institute of Science and Technology)
Lee, Seungheon (Water Cycle Research Center, Korea Institute of Science and Technology)
Jeong, Seongpil (Division of Energy and Environment Technology, University of Science and Technology)
Byun, Jeehye (Division of Energy and Environment Technology, University of Science and Technology)
Publication Information
Journal of Korean Society on Water Environment / v.38, no.3, 2022 , pp. 143-149 More about this Journal
Abstract
Membrane distillation (MD) has emerged as a sustainable desalination technology to solve the water and energy problems faced by the modern society. In particular, the surface wetting properties of the membrane have been recognized as a key parameter to determine the performance of the MD system. In this study, a novel surface modification technique was developed to induce a Janus-type hydrophilic/hydrophobic layer on the membrane surface. The hydrophilic layer was created on a porous PVDF membrane by vapor phase polymerization of the pyrrole monomer, forming a thin coating of polypyrrole on the membrane walls. A rigid polymeric coating layer was created without compromising the membrane porosity. The hydrophilic coating was then followed by the in-situ growth of siloxane nanoparticles, where the condensation of organosilane provided quick loading of hydrophobic layers on the membrane surface. The composite layers of dual coatings allowed systematic control of the surface wettability of porous membranes. By the virtue of the photothermal property of the hydrophilic polypyrrole layer, the desalination performance of the coated membrane was tested in a solar MD system. The wetting properties of the dual-layer were further evaluated in a direct-contact MD module, exploring the potential of the Janus membrane structure for effective and low-energy desalination.
Keywords
Hydrophilicity; Hydrophobicity; Membrane distillation; Organosilane; Polypyrrole; Surface functionalization;
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