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Membrane Water Treatment
  Volume 5, Number 3, July 2014, pages 171-182

Evaluation of interaction between organic solutes and a membrane polymer by an inverse HPLC method
Yoshiaki Kiso, Katsuya Hosogi, Yuki Kamimoto and Yong-Jun Jung

    Organic compounds are adsorbed on RO/NF membranes, and the adsorption may influence the rejection of organic compounds by the membranes. Because almost RO/NF membranes are composite membranes, the results obtained by adsorption experiment with using membrane pieces are unable to avoid the influence by the support membrane. In this work, the interaction between membrane polymer and organic solutes was examined by an inverse HPLC methodology. Poly (m-phenylenetrimesoylate), the constituent of skin layer of RO/NF membranes, was coated on silica gel particles and used as a stationary phase for HPLC. When water was used as a mobile phase, almost hydrophilic aliphatic compounds were not effectively adsorbed on the stationary phase, although hydrophobic compounds were slightly adsorbed. The results indicated that the hydrophilic aliphatic compounds are useful probe solutes to examine the molecular sieving effect of a membrane. When water was used as a mobile phase, the aromatic compounds were strongly retained, and therefore CH3CN/H2O (30/70) was used as a mobile phase. It was revealed that the adsorption of aromatic compounds was controlled by stacking between solute and polymer and was hindered by non-planar structure and substituents.
Key Words
    RO/NF membrane; polyamide; adsorption; organic solute; HPLC
(1) Yoshiaki Kiso, Katsuya Hosogi:
Department of Environmental and Life Sciences, Toyohashi University of Technology, Tempaku-cho, Toyohashi 441-8586, Japan;
(2) Yuki Kamimoto:
EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan;
(3) Yong-Jun Jung:
Department of Environmental engineering, Catholic University of Pusan, Oryundae-ro, Geumjeong-gu, Busan, 609-757, Korea.

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