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    Fabrication of Greener Membranes from Ionic Liquid Solutions

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    Name:
    PhD Dissertation_Dooli Kim_Summer 2017.pdf
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    5.694Mb
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    PDF
    Description:
    PhD Dissertation_Dooli Kim_Summer 2017
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    Type
    Dissertation
    Authors
    Kim, Dooli cc
    Advisors
    Nunes, Suzana Pereira cc
    Committee members
    Saikaly, Pascal cc
    Daffonchio, Daniele cc
    Figoli, Alberto
    Program
    Environmental Science and Engineering
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2017-06
    Embargo End Date
    2018-10-01
    Permanent link to this record
    http://hdl.handle.net/10754/625125
    
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    Access Restrictions
    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-87WP6
    DOI
    10.25781/KAUST-87WP6
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-87WP6
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Dissertations; Dissertations

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