Mechanically robust and highly permeable AquaporinZ biomimetic membranes

Hong Lei Wang, Tai Shung Chung, Yen Wah Tong, Kandiah Jeyaseelan, Arunmozhiarasi Armugam, Hoang Hanh Phuoc Duong, Fengjiang Fu, Harry Seah, Jing Yang, Minghui Hong

Research output: Contribution to journalArticleResearchpeer-review

66 Citations (Scopus)

Abstract

Seawater desalination and water reuse using membrane technology can provide a sustainable water supply to the world if such processes can be more energy-efficient. To harness the highly efficient water transport used by nature, it is proposed to incorporate trans-membrane water channel, AquaporinZ (AqpZ), into biomimetic membranes. However, the biomimetic membranes are intrinsically too fragile to be used in water purification. Here, we report a robust vesicular biomimetic membrane design and the synthesis route. The membrane is formed by cross-linking AqpZ-embedded block copolymer vesicles, followed by immobilizing vesicles on the membrane support via covalent binding, and then stabilizing through an optimized layer-by-layer polydopamine (PDA)-histidine (His) coating process. As compared with commercially available HTI membranes, the AqpZ-embedded vesicular membrane shows an order-of-magnitude increment in water flux (17.6L/m2/h) with high salt retention (91.8%) when using 6000ppm NaCl as the feed and 0.8M sucrose as the draw solute in the forward osmosis operation. Thus, the vesicular membrane design may provide new insights into the design and fabrication of Aqp-embedded biomimetic membranes.

Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalJournal of Membrane Science
Volume434
DOIs
Publication statusPublished - 1 May 2013
Externally publishedYes

Keywords

  • AquaporinZ
  • Biomimetic
  • Block copolymer
  • Forward osmosis
  • Vesicular membrane

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