Synthesis and fabrication of nanostructured hydrophobic polyazole membranes for low-energy water recovery
Alsaadi, Ahmad Salem
Amy, Gary L.
Nunes, Suzana Pereira
KAUST DepartmentWater Desalination and Reuse Research Center (WDRC)
Biological and Environmental Sciences and Engineering (BESE) Division
Environmental Science and Engineering Program
Water Desalination & Reuse Research Cntr
Nanostructured Polymeric Membrane Lab
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AbstractAromatic fluorinated polyoxadiazoles (F-POD) and polytriazoles (F-PT) were synthesized and for the first time manufactured into porous membranes by phase inversion and by electrospinning. The phase inversion F-POD membranes had a mean flow pore size (MFP) of 51nm, while for F-PT it was around 74nm. The electrospun membranes had a much larger pore size, the MFP for F-POD membrane was around 1.7μm and for F-PT it was 2.7μm. The membranes were tested for desalination of Red Sea water using direct contact membrane distillation (DCMD). By combining the high polymer hydrophobicity and high porosity, apparent contact angles up to 162° were obtained, assuring the operation with practically no liquid water leakage under pressure up to 0.9bar. Salt selectivity as high as 99.95% and water fluxes as high as 85Lm -2h -1 were demonstrated, operating at 80°C feed temperature and 22°C permeate. © 2012 Elsevier B.V.
JournalJournal of Membrane Science