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PhD Dissertation_Dooli Kim_Summer 2017.pdf
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PhD Dissertation_Dooli Kim_Summer 2017
Type
DissertationAuthors
Kim, Dooli
Advisors
Nunes, Suzana Pereira
Committee members
Saikaly, Pascal
Daffonchio, Daniele

Figoli, Alberto
Date
2017-06Embargo End Date
2018-10-01Permanent link to this record
http://hdl.handle.net/10754/625125
Metadata
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At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation became available to the public after the expiration of the embargo on 2018-10-01.Abstract
Membrane technology plays a crucial role in different separation processes such as biotechnology, pharmaceutical, and food industries, drinking water supply, and wastewater treatment. However, there is a growing concern that solvents commonly used for membrane fabrication, such as dimethylformamide (DMF), dimethylacetamide (DMAc), and 1-methyl-2-pyrrolidone (NMP), are toxic to the environment and human health. To explore the possibility of substituting these toxic solvents by less toxic or safer solvents, polymers commonly used for membrane fabrication, such as polyacrylonitrile (PAN), cellulose acetate (CA), polyethersulfone (PES), and poly(ether imide sulfone) (EXTEMTM), were dissolved in ionic liquids. Flat sheet and hollow fiber membranes were then fabricated. The thermodynamics of the polymer solutions, the kinetics of phase inversion and other factors, which resulted in significant differences in the membrane structure, compared to those of membranes fabricated from more toxic solvents, were investigated. Higher water permeance with smaller pores, unique and uniform morphologies, and narrower pore size distribution, were observed in the ionic liquid-based membranes. Furthermore, comparable performance on separation of peptides and proteins with various molecular weights was achieved with the membranes fabricated from ionic liquid solutions. In summary, we propose less hazardous polymer solutions to the environment, which can be used for the membrane fabrication with better performance and more regular morphology.Citation
Kim, D. (2017). Fabrication of Greener Membranes from Ionic Liquid Solutions. KAUST Research Repository. https://doi.org/10.25781/KAUST-87WP6ae974a485f413a2113503eed53cd6c53
10.25781/KAUST-87WP6