期刊
MACROMOLECULAR MATERIALS AND ENGINEERING
卷 306, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.202000818
关键词
forward osmosis; interfacial polymerization; polyethyleneimine interlayers; perm‐ selectivity; polyamide membranes
资金
- National Natural Science Foundation of China [51761145107]
- Science Foundation of the Chinese Academy of Sciences [YJKYYQ20190076]
- QIBEBT, CAS [QIBEBT I201923]
- Dalian National Laboratory for Clean Energy (DNL), CAS [QIBEBT I201923]
The study investigates the use of a PEI interlayer in the design of TFC membranes to improve separation performance and enhance water flux, perm-selectivity, and antifouling capacity.
Thin-film composite (TFC) membranes comprised of a polyamide (PA) selective layer upon a porous substrate dominate the forward osmosis (FO) membrane market. However, further improvement of perm-selectivity still remains a great challenge. Herein, a polyethyleneimine (PEI) interlayer is intentionally designed prior to interfacial polymerization (IP) to tailor the PA layer, which thus improves the separation performance. The PEI interlayer not only improves the substrate hydrophilicity for adsorbing more diamine monomer and controlling its release rate, but also participates in IP reaction by crosslinking with acyl chloride (TMC). Furthermore, it can decrease the electronegativity of the substrate for decreasing reverse salt diffusion. Consequently, a denser, thinner and smoother PA layer is formed due to the uniform distribution, controllable release of diamine monomer and the extra crosslinking between PEI and TMC. Furthermore, the PA layer becomes more hydrophilic with PEI involvement. As a result, the asprepared TFC membrane exhibits a favorable water flux of 16.1 L m(-2) h(-1) and an extremely low reverse salt flux (1.25 g m(-2) h(-1)). Meanwhile, it achieves an excellent perm-selectivity with a ratio of water to salt permeability coefficient of 8.25 bar(-1). Moreover, it exhibits an outstanding antifouling capacity. The work sheds light on fabricating high perm-selective membranes for desalination.
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