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Single‐Walled Carbon Nanotube Film Supported Nanofiltration Membrane with a Nearly 10 nm Thick Polyamide Selective Layer for High‐Flux and High‐Rejection Desalination
Author(s) -
Zhu Yuzhang,
Xie Wei,
Gao Shoujian,
Zhang Feng,
Zhang Wenbin,
Liu Zhaoyang,
Jin Jian
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201601253
Subject(s) - nanofiltration , polyamide , membrane , materials science , carbon nanotube , desalination , chemical engineering , layer (electronics) , thin film composite membrane , nanotube , reverse osmosis , porosity , nanotechnology , composite material , chemistry , biochemistry , engineering
Fabricating nanofiltration (NF) membranes with high permeating flux and simultaneous high rejection rate for desalination is rather significant and highly desired. A new avenue is reported in this work to design NF membrane by using polydopamine wrapped single‐walled carbon nanotube (PD/SWCNTs) ultrathin film as support layer instead of the use of traditional polymer‐based underlying layers. Thanks to the high porosity, smooth surface, and more importantly optimal hydrophilic surface of PD/SWCNTs film, a defect‐free polyamide selective layer for NF membrane with thickness of as thin as 12 nm is achieved. The obtained NF membrane exhibits an extremely high performance with a permeating flux of 32 L m −2 h −1 bar −1 and a rejection rate of 95.9% to divalent ions. This value is two to five times higher than the traditional NF membranes with similar rejection rate.