期刊
JOURNAL OF MEMBRANE SCIENCE
卷 434, 期 -, 页码 130-136出版社
ELSEVIER
DOI: 10.1016/j.memsci.2013.01.031
关键词
Biomimetic; AquaporinZ; Vesicular membrane; Forward osmosis; Block copolymer
资金
- Singapore's National Research Foundation (NRF) through the Environment and Water Industry Programme Office (EWI) [0804-IRIS-01]
- NUS [R-279-000-293-272]
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 (17.6 L/m(2)/h) with high salt retention (91.8%) when using 6000 ppm NaCl as the feed and 0.8 M 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. (C) 2013 Elsevier B.V. All rights reserved.
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