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Effectively regulating interfacial polymerization process via in-situ constructed 2D COFs interlayer for fabricating organic solvent nanofiltration membranes.

Authors :
Yang, Chenran
Li, Shuxuan
Lv, Xinghua
Li, Honghai
Han, Lihui
Su, Baowei
Source :
Journal of Membrane Science. Nov2021, Vol. 637, pN.PAG-N.PAG. 1p.
Publication Year :
2021

Abstract

Covalent organic frameworks (COFs) nanomaterials have broad application prospects for the fabrication of separation membranes due to their high porosity, adjusted pore size, and excellent chemical stability. In this work, we in-situ constructed an ultra-thin layer of two-dimensional COFs nanomaterial using interfacial condensation between p -phenylenediamine and 1,3,5-triformylphloroglucinol, both with ultra-low concentration, on polyimide substrate surface to manipulate the subsequent interfacial polymerization between m -phenylenediamine of ultra-low concentration and trimesoyl chloride to fabricate a kind of thin film nanocomposite (TFN) membrane for organic solvent nanofiltration (OSN). The fabricated TFN OSN membrane achieves a Rhodamine B (479 Dalton) rejection and an ethanol permeance of higher than 99% and of 60 L m−2 h−1 MPa−1, respectively. Moreover, it has ultra-smooth surface with much thin skin layer, and high permeance for polar solvents such as methanol and ethanol. Besides, it has a molecular weight cut-off of about 375 Dalton. Moreover, it can maintain good separation performance after more than 10 days' immersion in N , N -dimethylformamide (DMF) at 80 °C, or after 120 h crossflow filtration with 100 mg L−1 Rose Bengal (1017 Dalton) - DMF solution as feed at 25 °C, indicating its vast potential for industrial application in harsh solvent environment. [Display omitted] • In-situ constructing nano-porous interlayer of two-dimensional COFs using Tp and Pa. • COFs interlayer effectively regulated the interfacial polymerization process. • COFs interlayer has profound effect on structure and performance of the OSN membrane. • The fabricated OSN membrane has ultra-smooth and ultra-thin barrier layer. • The fabricated OSN membrane has demonstrated superior solvent resistance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03767388
Volume :
637
Database :
Academic Search Index
Journal :
Journal of Membrane Science
Publication Type :
Academic Journal
Accession number :
151913112
Full Text :
https://doi.org/10.1016/j.memsci.2021.119618