Superior cross-linking assisted layer by layer modification of forward osmosis membranes for brackish water desalination

Wafa Suwaileh, Daniel Johnson, Saeed Khodabakhshi, Nidal Hilal

    Research output: Contribution to journalArticle

    Abstract

    In this work, a novel surface modification strategy was developed to modify polyethersulfone membrane substrate to create membranes for forward osmosis applications. A novel poly(ethylenimine) crosslinked Hexadecafluorodecanedioic acid polyelectrolyte was synthesized, followed by layer deposition on the surface of an ultrafiltration membrane substrate. While the unmodified membrane was negatively charged, this procedure reversed the surface charge, leading to a positively charged forward osmosis-nanofiltration membrane. Interestingly, at pH 7, the zeta potential approached 6.9 mV for membrane coated 4.5 as compared to the pristine membrane with a zeta potential value of approximately −11.0 mV. Extensive characterization and chemical analyses were carried out to ensure the effectiveness of the developed separation layer. The results revealed that the poly(ethylenimine) crosslinked Hexadecafluorodecanedioic acid was successfully deposited on the polyethersulfone membrane substrate. Preparation conditions, such as curing temperature and time were optimized. It was found out that membrane coated with 3.5 bilayers and cured at 60 °C for one hour exhibited optimal water permeability of 21.9 L m −2 h −1 bar‐1 of and solute permeability of 1.66 L m −2 h −1 as compared to the neat membrane.

    Original languageEnglish (US)
    Pages (from-to)1-12
    Number of pages12
    JournalDesalination
    Volume463
    DOIs
    StatePublished - Aug 1 2019

    Fingerprint

    Osmosis membranes
    Desalination
    osmosis
    brackish water
    membrane
    Membranes
    Water
    Zeta potential
    substrate
    Substrates
    Saline Waters
    water desalination
    Nanofiltration membranes
    permeability
    Osmosis
    Acids
    Ultrafiltration
    Surface charge
    acid
    Polyelectrolytes

    Keywords

    • Brackish water desalination
    • Forward osmosis
    • Layer by layer assembly
    • Modeling
    • Polyether sulfone membrane

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Materials Science(all)
    • Water Science and Technology
    • Mechanical Engineering

    Cite this

    Superior cross-linking assisted layer by layer modification of forward osmosis membranes for brackish water desalination. / Suwaileh, Wafa; Johnson, Daniel; Khodabakhshi, Saeed; Hilal, Nidal.

    In: Desalination, Vol. 463, 01.08.2019, p. 1-12.

    Research output: Contribution to journalArticle

    Suwaileh, Wafa ; Johnson, Daniel ; Khodabakhshi, Saeed ; Hilal, Nidal. / Superior cross-linking assisted layer by layer modification of forward osmosis membranes for brackish water desalination. In: Desalination. 2019 ; Vol. 463. pp. 1-12.
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