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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
