Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 157, Issue -, Pages 60-71Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2015.11.029
Keywords
Hydrophilic SiO2 nanoparticles; Non-woven fabric polyester; Flux; Finger-like layer; Sponge-like layer; Membrane structure; Vacuum Membrane Distillation (VMD)
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Funding
- NSERC Discovery Grant
- I2I Grant
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Effects of hydrophilic silica nanoparticles and Non-Woven Fabric (NWF) backing material on the properties and performance of the Polyvinylidene Fluoride (PVDF) membrane have been studied in this work. The nanocomposite membranes were prepared by the phase inversion method and characterized in terms of surface pore size, cross-sectional morphology, thickness, porosity, surface roughness and hydrophobicity. The fabricated membranes were subjected to Vacuum Membrane Distillation (VMD) experiments and their performance was evaluated through measuring the pure water flux and salt rejection. According to the results, effects of the hydrophilic nano-additives and NWF polyester enabled much higher VMD flux than the neat PVDF membrane when an appropriate amount of the nano-filler was added, possibly due to increase in the surface pore size and the reduction of the sponge-like layer thickness. The supported nanocomposite membranes possessed appropriate Liquid Entry Pressure (LEPw) and mechanical strength, which make the membrane applicable in VMD process. When 7.0 wt.% of the silica nanoparticles was incorporated in a NWF supported membrane, the pure water flux became 12749.6 g/m(2) h at feed temperature of 27.5 degrees C and permeate side pressure of 1.2 kPa, representing a 2456% increase from the neat PVDF membrane. Almost complete NaCl rejection was also achieved when tested with 35 g/L NaCl aqueous solution. (C) 2015 Published by Elsevier B.V.
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