4.7 Article

Masking covalent organic frameworks (COFs) with loose polyamide networks for precise nanofiltration

Journal

SEPARATION AND PURIFICATION TECHNOLOGY
Volume 283, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.seppur.2021.120233

Keywords

Nanofiltration; Covalent organic frameworks (COFs); Heterostructured membrane; Precise separation

Funding

  1. National Natural Science Foundation of China [21825803, 21921006]

Ask authors/readers for more resources

Covalent organic frameworks (COFs) are promising alternatives to prepare high-resolution molecular sieving nanofiltration membranes. However, the preparation of continuous and defect-free COF membranes with tunable pore sizes is still challenging. In this study, a strategy to prepare heterostructured membranes with loose polyamide networks masked COF nanofilms for precise sieving of small molecules was introduced.
Covalent organic frameworks (COFs) with uniform, tunable nanoporosities are promising alternatives to prepare nanofiltration membranes with homogeneous nanochannels for high-resolution molecular sieving. Due to the poor membrane-forming ability as well as the relatively inadequate strategies for pore engineering, thus far, the preparation of continuous and defect-free COF membranes with tunable pore sizes is still challenging. Herein, we demonstrate an ingenious strategy to prepare the heterostructured membranes featuring the loose polyamide networks masked COF nanofilms for precise sieving of small molecules. The loosely structured polyamides are created by the interfacial polymerization to mask the chemically stitched (chemically interlinked) ultrathin COF nanosheets. The masked polyamide with flexible, loose networks not only enhance the membrane-forming ability of the natively rigid ultrathin COF nanofilms, but also provide a masking effect that can effectively tune the pore size of the heterostructured COF membranes. Benefitting from the synergistic enhancement of the membraneforming ability and the pore size tunability, thus-prepared membranes exhibit excellent molecular sieving performances toward various small molecules. This work is expected to provide a guidance for the rational design and controllable preparation of COF membranes for precise nanofiltration.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available