Effects of surface modification on antifouling and performance properties of reverse osmosis membranes

J. Gilron, S. Belfer, P. Väisänen, M. Nyström

    Research output: Contribution to journalArticlepeer-review

    139 Scopus citations

    Abstract

    The effects of surface modification of commercial reverse osmosis (RO) polyamide membranes were studied in terms of flux/rejection and surface properties. Selected RO membranes, spanning ultra-low pressure to seawater membranes, were modified by in-situ graft polymerization using redox generation of monomer radicals. Modification of the membrane significantly reduced both receding and advancing contact angles of some of the membranes as measured by a modified Wilhelmy plate method. Lower contact angles indicate more hydrophilic membranes and such membranes will potentially show better resistance to fouling by hydrophobic foulants. This was confirmed by adsorption measurements carried out on modified and unmodified membranes with a highly fouling surface water. Modified membranes adsorbed less organic material and were more easily cleaned than unmodified membranes. Specific fluxes were not changed by more than 0-25% and NaCl rejection was unchanged or increased slightly.

    Original languageEnglish
    Pages (from-to)167-179
    Number of pages13
    JournalDesalination
    Volume140
    Issue number2
    DOIs
    StatePublished - 1 Nov 2001

    Keywords

    • Contact angle
    • Membrane modification
    • Organic fouling
    • Reverse osmosis

    ASJC Scopus subject areas

    • General Chemistry
    • General Chemical Engineering
    • General Materials Science
    • Water Science and Technology
    • Mechanical Engineering

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