期刊
JOURNAL OF MEMBRANE SCIENCE
卷 500, 期 -, 页码 265-271出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2015.11.046
关键词
Nanofiltration membrane; Thin film composite; Zirconia; Polydopamine; Polyethylenimine
资金
- Natural Science Foundation of Zhejiang Province, China [LZ15E030001]
- National Natural Science Foundation of China [21534009]
Thin film composite (TFC) membranes with ultrathin dense selective layer have emerged as a promising candidate for nanofiltration with excellent permeation and rejection performance. Herein, novel organic-inorganic TFC nanofiltration membranes (TFC NFMs) are fabricated via the mussel-inspired modification of ultrafiltration membrane followed by a mineralization process. Hydrolyzed polyacrylonitrile (HPAN) ultrafiltration membrane is facilely co-deposited with polydopamine (PDA) and polyetheylenimine (PEI), and the PDA-PEI coating further induces the growth of zirconia (ZrO2) nanoparticles on the membrane surface. The formed zirconia selective layer is defect-free, uniform, and ultrathin (10-20 nm). The organic-inorganic TFC NFMs show high retention ( > 90%) for bivalent cations with a salts rejection sequence of MgCl2 > CaCl2 > MgSO4 > NaCl > Na2SO4 at pH 6.0 ascribed to the positively charged membrane surface. The water flux reaches as high as 60 L/m(2) h under 0.6 MPa due to the ultrathin and hydrophilic properties of the inorganic selective layer. Moreover, the organic-inorganic TFC NFMs show good structure stability for long-term nanofiltration operation. (C) 2015 Elsevier B.V. All rights reserved.
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