Issue 44, 2017

One-step constructed ultrathin Janus polyamide nanofilms with opposite charges for highly efficient nanofiltration

Abstract

Preparation of nanofiltration membranes (NFMs) with high rejection to both divalent cations and anions and simultaneous high water permeation is rather significant and highly desired. Herein, we engineered an ultrathin Janus polyamide (PA) separating layer with opposite charges in one step through the “self-regulation” process of low temperature interfacial polymerization (LTIP). The low temperature strategy plays a crucial role in optimizing the “self-regulation” process. It can reduce the transmission rate of aqueous monomers to the top reaction zone and thus the thickness of the reaction zone, resulting in an ultrathin Janus PA separating layer. Owing to the collaborative separation effect and reduced thickness of the Janus separating layer, our NFMs exhibit excellent comprehensive separation performance with high rejection to both divalent cations and anions and desirable water permeation, simultaneously, which exceeds the separation performance upper bound of state-of-the-art NFMs. Furthermore, these NFMs show outstanding anti-fouling performance owing to the uniform and smooth upper surface. The methodology reported here is easy to couple with current commercialized interfacial polymerization technology, making up-scaling feasible.

Graphical abstract: One-step constructed ultrathin Janus polyamide nanofilms with opposite charges for highly efficient nanofiltration

Supplementary files

Article information

Article type
Paper
Submitted
28 Aug 2017
Accepted
10 Oct 2017
First published
10 Oct 2017

J. Mater. Chem. A, 2017,5, 22988-22996

One-step constructed ultrathin Janus polyamide nanofilms with opposite charges for highly efficient nanofiltration

S. Liu, C. Wu, W. Hung, X. Lu and K. Lee, J. Mater. Chem. A, 2017, 5, 22988 DOI: 10.1039/C7TA07582K

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