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    Surface Modification of Thin Film Composite RO Membrane for Enhanced Anti-Biofouling Performance

    Year: 2013

    Journal: Journal of Membrane Science, Volume 444, 1 October 2013, Pages 192–200, 20131119

    Authors: Juha Nikkola, Xin Liu, Ye Li, Mari Raulio, Hanna-Leena Alakomi, Jing Wei, Chuyang Y. Tang

    Organizations: VTT Technical Research Centre of Finland P.O. Box 1300, 33101 Tampere, Finland P.O. Box 1000, 02044 Espoo, Finland, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, 639798, Singapore Membrane Technology Centre, Nanyang Technological University, Singapore, 637141

    Anti-adhesion and antimicrobial coatings were prepared and applied on commercial thinfilm-composite (TFC) polyamide (PA) membrane to enhance anti-biofouling performance.Polyvinyl alcohol (PVA) coating was modified with cationic polyhexamethylene guanidinehydrochloride (PHMG) polymer to obtain antimicrobial performance. ATR-FTIR, SEM andAFM investigated the surface chemistry and morphology of the coated membranes. Thecontact angle measurement was used to determine hydrophilicity and surface energy. Allcoated membranes revealed more hydrophilic and lower surface roughness compared touncoated membrane. Lower number of adhered Pseudomonas aeruginosa (P. aeruginosa)bacteria was detected on coated membranes, indicating anti-adhesion performance. Thecolony forming unit (CFU) and diffusion inhibition zone (DIZ) tests determinedantimicrobial activity of the coated membranes against Escherichia coli (E. coli) and Bacillussubtilis (B. subtilis), showing the antimicrobial performance of PHMG. The results suggestedthat an optimal anti-fouling surface could be obtained applying a coating, which combinesanti-adhesion and antimicrobial performance.