Ultrathin nanofiltration membrane with polydopamine-covalent organic framework interlayer for enhanced permeability and structural stability

被引:275
作者
Wu, Mengyuan [1 ]
Yuan, Jinqiu [1 ]
Wu, Hong [1 ,2 ]
Su, Yanlei [1 ]
Yang, Hao [1 ]
You, Xinda [1 ]
Zhang, Runnan [1 ]
He, Xueyi [1 ]
Khan, Niaz Ali [1 ]
Kasher, Roni [3 ]
Jiang, Zhongyi [1 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Key Lab Green Chem Technol, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Tianjin Key Lab Membrane Sci & Desalinat Technol, Tianjin 300072, Peoples R China
[3] Ben Gurion Univ Negev, Zuckerberg Inst Water Res, Jacob Blaustein Inst Desert Res, Dept Desalinat & Water Treatment, Sede Boqer Campus, IL-84990 Beer Sheva, Israel
基金
中国国家自然科学基金;
关键词
Covalent organic framework; High flux; Structural stability; Nanofiltration membrane; Interfacial polymerization; FILM COMPOSITE MEMBRANES; POLYAMIDE NANOFILMS; LAYER; FABRICATION; TRANSPORT; SUPPORT;
D O I
10.1016/j.memsci.2019.01.040
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Nanofiltration is a promising technology towards desalination and water purification. However, the pursuit for separation efficiency was hampered by the thick and less controllable selective layer. Herein, the ultrathin composite membranes with enhanced nanofiltration (NF) performance were achieved by interfacial polymerization mediated by polydopamine (PDA)-covalent organic framework (COF) interlayer. The hybrid interlayer with exceptional surface hydrophilicity and high porosity controlled the adsorption/diffusion of amine monomers during the interfacial polymerization process and generated an ultrathin and dense polyamide (PA) layer, which was immensely reduced from 79 nm to 11 nm in thickness. The PA/PDA-COF/PAN nanofiltration membrane exhibited desirable desalination ratio (93.4% for Na2SO4) and dye rejection (94.5% for Orange GII), along with outstanding water permeation flux of 207.07 L m(-2) h(-1) MPa-1, 3 times higher than that of commercial NF membranes with similar solute rejection. Moreover, the hybrid interlayer significantly strengthened the interfacial interaction between the PA layer and the polyacrylonitrile (PAN) support, rendering the composite membrane with superior structural stability. The proposed strategy provided novel insight into the rational design of multifunctional interlayer to manipulate interfacial polymerization for high-performance PA membranes.
引用
收藏
页码:131 / 141
页数:11
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