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Tuning molecular sieving channels of layered double hydroxides membrane with direct intercalation of amino acids

Abstract

Two-dimensional (2D) materials have been widely used to construct efficient molecular sieving and transport channels in membrane separation. However, the controllable architecture and properties of the separation channel is still a great challenge. In this study, we propose a facile and feasible approach to prepare layered double hydroxide (LDH) composite membranes on tubular ceramic substrate by using amino acids (such as glycine, serine and alanine) as intercalation molecules. Interlayer spacing formed in the stacked LDH nanosheets provides transport channels for water molecules, which are modified through in situ intercalating amino acid molecules with different molecular size and hydrophilic properties. The amino acid intercalated LDH membranes exhibited high permeance without sacrificing rejection compared with pristine LDH membranes. Particularly, the glycine intercalated LDH composite membrane with expanded hydrophilic transport channels shows the permeance of 566 Lm-2h-1MPa-1 and a rejection about 98.5% towards eriochrome black T (EBT) molecule. The permeance is 2.2-fold higher than that of the pristine LDH membrane. Moreover, molecular simulation was also used to interpret the intercalation and separation mechanism of the LDH membrane. We anticipate that this study may extend the materials and methods to regulate and control the transport channels in membrane.

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Publication details

The article was received on 29 Jun 2018, accepted on 03 Aug 2018 and first published on 03 Aug 2018


Article type: Paper
DOI: 10.1039/C8TA06233A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Tuning molecular sieving channels of layered double hydroxides membrane with direct intercalation of amino acids

    N. Wang, Z. Huang, X. Li, J. Li, S. Ji and Q. an, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA06233A

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