Ultrathin nanofiltration membrane with polydopamine-covalent organic framework interlayer for enhanced permeability and structural stability
By Mengyuan Wu, Jinqiu Yuan, Hong Wu, Yanlei Su, Hao Yang, Xinda You, Runnan Zhang, Xueyi He, N. Khan, R. Kasher and 1 more. Journal of Membrane Science, 2019
290 citations recorded by the source corpus.
Abstract 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.
Subfields: Materials Chemistry, Mechanical Engineering, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/acd61d6d5282ecad014b8fa2dd7a3319b6c0e69a
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Citations in the corpus
- Unidirectional diffusion synthesis of covalent organic frameworks (COFs) on polymeric substrates for dye separation (2019, background): “membrane performances by introducing COFs interlayers [35] or matrix [36–38] for gas separation and liquid purification have been reported.”