Comparison of various membrane distillation methods for desalination using hydrophobic ceramic membranes

Membrane distillation (MD) is an emerging separation process suitable for desalination of brackish or seawater. In this technique, hydrophobic membranes are required to allow only water vapour permeation through the porous barrier. In this work, zirconia and titania ceramic membranes with pore diame...

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Bibliographic Details
Published inJournal of membrane science Vol. 337; no. 1; pp. 55 - 60
Main Authors Cerneaux, Sophie, Strużyńska, Izabela, Kujawski, Wojciech M., Persin, Michel, Larbot, André
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.07.2009
Elsevier
Subjects
Chemical Sciences
Desalination
Grafting
Hydrophobic ceramic membranes
Material chemistry
Membrane distillation
Hydrophobic ceramic membranes
Grafting
Membrane distillation
Desalination
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Summary:Membrane distillation (MD) is an emerging separation process suitable for desalination of brackish or seawater. In this technique, hydrophobic membranes are required to allow only water vapour permeation through the porous barrier. In this work, zirconia and titania ceramic membranes with pore diameters of 50 nm (Zr50) and 5 nm (Ti5), respectively, were chemically modified to change their hydrophilic feature into hydrophobic one by grafting of the C 8F 17(CH 2) 2Si(OC 2H 5) 3 perfluoroalkylsilane molecule (C8). Water contact angles around 160° were measured, indicative of highly hydrophobic membranes. Desalination of NaCl solutions of 0.5 and 1 M was performed using three MD configurations, AGMD, DCMD and VMD methods, with the aim to compare their efficiency. High salt rejection rates higher than 99% were obtained in all investigated configurations.
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ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2009.03.025