Single-Walled Carbon Nanotube Film Supported Nanofiltration Membrane with a Nearly 10 nm Thick Polyamide Selective Layer for High-Flux and High-Rejection Desalination

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• 作者：Yuzhang Zhu ; Wei Xie ; Shoujian Gao ; Feng Zhang ; Wenbin Zhang ; Zhaoyang Liu and Jian Jin
• 刊名：Small
• 出版年：2016
• 出版时间：September 28, 2016
• 年：2016
• 卷：12
• 期：36
• 页码：5034-5041
• 全文大小：2499K
• ISSN：1613-6829

文摘

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.