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Enhancing the long-term separation stability of TFC membrane by the covalent bond between synthetic amino-substituted polyethersulfone substrate and polyamide layer.
- Source :
-
Journal of Membrane Science . Nov2021, Vol. 637, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- The weak interfacial force among the substrate with polyamide layer is always a non-ignorable issue for the traditional thin-film composite (TFC) membrane during actual operation. To solve this issue, herein, we have proposed an effective strategy, which is enhancing the long-term separation durability of the TFC membrane by fixing the polyamide layer on the substrate through covalent bonding. To start with, an amino-substituted polyethersulfone (PES-NH 2) was synthesized and blended with polyethersulfone (PES) to prepare a hydrophilic PES/PES-NH 2 substrate. Next, the amino group in the substrate could effectively react with a part of acyl chloride groups in the organic phase to form the stable covalent bond with the polyamide layer formed by interfacial polymerization. The prepared PES/PES-NH 2 TFC membrane possessed a denser polyamide layer with a higher cross-linking degree, as well as exhibited greatly increased separation performance at 0.6 MPa. Significantly, the PES/PES-NH 2 TFC membrane still maintained excellent separation performance under a long-term filtration period of 15 days, which is also much longer than the PES TFC membrane. This effective and promising method provides a valuable way to maintain the separation stability of TFC membrane in long-term operation. [Display omitted] • An amino-substituted polyethersulfone (PES-NH 2) resin was successfully synthesized. • The hydrophilic PES/PES-NH 2 substrate membrane containing amino groups was firstly prepared. • The PES/PES-NH 2 TFC polyamide membrane showed good long-term separation stability. • The mechanism of strengthening the interface connection between the substrate and the polyamide layer was elaborated. [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 :
- 151913130
- Full Text :
- https://doi.org/10.1016/j.memsci.2021.119637