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Surface coating of polyamide reverse osmosis membranes with zwitterionic 3‐(3,4‐dihydroxyphenyl)‐l‐alanine (l‐DOPA) for forward osmosis

Seda Saki,N. Uzal

Published 2019 in Water and Environment Journal

ABSTRACT

To overcome low permeability and fouling problems of membranes used in FO processes, modification is needed to improve the hydrophilicity, permeability and selectivity of membranes. In this work, thin film composite (TFC) commercial polyamide RO membranes (BW30‐LE, SW30‐HR, AG and AC) were functionalized with zwitterionic l‐DOPA. The effect of l‐DOPA on the morphology of membranes was determined via SEM, FT‐IR, AFM and contact angle analysis. The l‐DOPA modified BW30‐LE membrane showed excellent properties with 46° contact angle and 3.8 L/m2hbar water permeability and 0.83 L/m2h salt permeability. Although, l‐DOPA modified BW30‐LE membrane had the highest water flux and hydrophilicity, l‐DOPA modified SW30‐HR membrane showed higher FO flux with 9.38 L/m2h than BW 30 membrane with 3.5 L/m2h at 50 g/L NaCl draw solution. Introducing hydroxyl and carboxyl ionic groups on the membrane surface with l‐DOPA coating enhanced the FO performance and water permeability which provide a new insight in FO applications.

PUBLICATION RECORD

  • Publication year

    2019

  • Venue

    Water and Environment Journal

  • Publication date

    2019-03-27

  • Fields of study

    Materials Science, Chemistry, Engineering

  • Identifiers
    DOI 10.1111/wej.12475
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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