Surface modification of commercial cellulose acetate membranes using surface-initiated polymerzation of 2-hydroxyethyl methacrylate to improve membrane surface biofouling resistance

Clare Worthley, Kristina Constantopoulos, Milena Ginic-Markovic, Rachel Pillar, Janis Matisons, Stephen Clarke

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    58 Citations (Scopus)

    Abstract

    To improve biofouling resistance, cellulose acetate (CA) reverse osmosis membranes were modified by reacting surface hydroxyl groups with an atom transfer radical polymerization (ATRP) initiator, 2-bromoisobutyryl bromide, followed by polymeric grafting of 2-hydroxyethyl methacrylate (pHEMA) using activators regenerated by electron transfer (ARGET) ATRP. Thermogravimetric analysis (TGA), atomic force microscopy (AFM) and water contact angle (WCA) measurements of pristine and modified membranes were performed to measure and compare the amount of polymer deposited, the surface morphology and the hydrophilicity of the surfaces, respectively. Roughness and hydrophilicity increased with graft density. The biofouling resistance of pHEMA-modified membranes immersed in seawater aquarium tanks was compared to pristine membranes and the effect of pHEMA coating on water flux and NaCl rejection was measured. Based on stirred-cell and aquaria experiments, pHEMA-modified membranes with low graft density showed just a 6% decrease in salt rejection and water flux relative to pristine CA membranes, and a 24% improvement in resistance to seawater microbial biofouling.

    Original languageEnglish
    Pages (from-to)30-39
    Number of pages10
    JournalJournal of Membrane Science
    Volume385-386
    Issue number1
    DOIs
    Publication statusPublished - 2011

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