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Updated: May 18, 2026

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
Published on: April 7, 2017
Retention characteristics of water-soluble compounds on water-holding adsorbents with immobilized zwitterionic
Waka Kamichatani1, Yoshinori Inoue, Mitsuru Saito
1Products Planning & Development Department, R&D Center, Nippon Filcon Co., Ltd., Inagi-shi, Tokyo, Japan. w-kamichatani@filcon.co.jp
Abstract:
Three kinds of water-holding adsorbents with immobilized zwitterionic copolymers having different cationic ionicities were synthesized. To investigate the influence of the charge balance and the ionicity of the cation site, the retention properties of the water-soluble solutes on the zwitterionic adsorbents were measured by HPLC. These adsorbents had high water contents, and the hydrating water contents depended on the amounts of immobilized copolymer. The retentions of water-soluble solutes depended on the hydrophilic interaction, and were in the order of logP(o/w) (logarithm of octanol-water partition coefficient). This suggests that the partition to the hydration layer was the main retention mechanism on the zwitterionic adsorbents. On the other hand, the electrostatic interaction based on the cation site on the adsorbents was also observed. The electrostatic interaction could be reduced by decreasing the ionicity of the cation sites. These results indicate that the retentions of the water-soluble solutes on the zwitterionic adsorbents were greatly influenced by the ionicity of the cation sites on the adsorbents.
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