Electrophoretic nuclei assembly of MOFs in polyamide membranes for enhanced nanofiltration
(2021) Desalination — Vol. 512, p. 115125 (2021)
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- Abstract
- Thin film nanocomposite (TFN) polyamide (PA) membranes has drawn increasing attention due to the improved physicochemical properties of the top layer for versatile separation performance. However, the commonly used fabrication approach, lacking a controllable loading of nanofillers, leads to a random and insufficient distribution of nanofillers into the PA layer and generates interfacial defects that deteriorate the membrane performance. Herein, a rational strategy for incorporating metal-organic frameworks (i.e., ZIF-8) into the PA layer via electrophoretic deposition (EPD) was proposed. Driven by an external direct current field, the ZIF-8 nanoparticles were uniformly assembled onto a porous ultrafiltration (UF) substrate for fabrication of high-performance TFN nanofiltration membranes by vacuum-assisted interfacial polymerization (IP). The resultant TFN nanofiltration membrane yielded an enhanced water permeability of 22.4 ± 1.2 L⋅m− 2 ⋅h− 1 ⋅bar− 1, due to incorporation of ZIF-8 nanoparticles which created extra nano-channels for fast water permeation. Additionally, such an EPD process effectively tailored the membrane surface properties (e.g., zeta potential) and conferred a considerably high rejection for Na2SO4 (96.9 ± 0.7%) but a low rejection for NaCl (18.9 ± 2.5%), semonstrating an excellent selectivity between SO4 2− and Cl− ions. This study highlights the impressive efficacy of the EPD process in precisely anchoring nanomaterials to design high-performance TFN nanofiltration membranes for target separations.
- Affiliations
Jiangnan University Laboratory of Environmental Biotechnology Fuzhou University Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology Zhengzhou University School of Chemical Engineering and Energy KU Leuven Department of Chemical Engineering
Citations
Li, J., Liu, R., Zhu, J., Li, X., Yuan, S., Tian, M., Wang, J., Luis Alconero, P., Van der Bruggen, B., & Lin, J. (2021). Electrophoretic nuclei assembly of MOFs in polyamide membranes for enhanced nanofiltration. Desalination, 512, 115125. https://doi.org/10.1016/j.desal.2021.115125 (Original work published 2021)