期刊
JOURNAL OF MEMBRANE SCIENCE
卷 618, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2020.118754
关键词
Polyamide (PA); Covalent organic frameworks (COFs); Thin-film nanocomposite (TFN) membrane; Desalination
资金
- National Science Foundation of China [21825803, 21921006]
- Program of Excellent Innovation Teams of Jiangsu Higher Education Institutions
- Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
A unique fabrication strategy for TFN membranes is proposed, featuring chemically stitched COF nanosheets at oil-water interfaces and in-situ formed PA matrices. The stitched nanofilms contain perpendicularly oriented pores, capable of sieving salt ions efficiently, providing high separation precision and fast water permeation for TFN membranes. This work demonstrates a desired strategy to control the orientation of COF nanosheets, applicable in various fields beyond membrane separation.
Embedding nanofillers into polyamide (PA) matrices is considered as a simple yet effective strategy for boosting the performances of thin-film nanocomposite (TFN) nanofiltration (NF) membranes. However, the NF performances are usually compromised by the inadequate interface compatibility between nanofillers and PA matrices as well as the anisotropic orientation of nanofillers. Herein, we propose a distinctive fabrication strategy for TFN membranes featuring excellent compatibility and highly-aligned microstructures. The reactive covalent organic framework (COF) nanosheets are chemically stitched at oil-water interfaces to form continuous nanofilms, and the PA matrices are then in-situ formed to encapsulate them, giving the TFN membranes. The stitched nanofilms contain two types of perpendicularly oriented pores: intrinsic apertures in COF nanosheets, and gaps among adjacent nanosheets. Together with the abundant reactive sites, the stitched nanofilms not only mediate the controllable synthesis of PA matrices, but also are covalently fused into the matrices. The aligned pores of the stitched nanosheets are capable of sieving salt ions, endowing TFN membranes with high separation precision and fast water permeation. This work demonstrates a strategy to control the orientation of COF nanosheets, which is highly desired in diverse fields not limited to membrane separation.
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