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Two-dimensional Ti2CTx MXene membranes with integrated and ordered nanochannels for efficient solvent dehydration

Abstract

Two-dimensional (2D) material membranes have shown great potential for molecular separation. However, it remains challenge on controllably tuning the 2D material membrane structure with ordered nanochannels without non-selective defects. Here, for the first time, 2D Ti2CTx MXene membrane is designed and fabricated for efficient solvent dehydration via a new strategy. Specifically, positive-charged hyperbranched polyethylenimine was intercalated between negative-charged MXene nanosheets to assemble regular stacking structure via electrostatic interaction, followed by interfacial polymerization with trimesoyl chloride to seal possible non-selective defects. This strategy realized integrated Ti2CTx membranes as thin as ~100 nm with highly ordered 2D nanochannels, thereby exhibiting outstanding separation performance: enriching water content to >99 wt% in permeate from 10 wt% water/isopropanol mixtures. Compared with commonly-studied Ti3C2Tx MXene membrane prepared by the same approach, the Ti2CTx membrane showed higher selectivity with similarly high flux. The membrane fabrication approach developed here offers a powerful platform for rational design of 2D material thin films for precise molecular separation and beyond.

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Publication details

The article was received on 09 Feb 2019, accepted on 10 Apr 2019 and first published on 12 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01507H
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Two-dimensional Ti2CTx MXene membranes with integrated and ordered nanochannels for efficient solvent dehydration

    G. Liu, J. Shen, Y. Ji, Q. Liu, J. Yang, G. Liu and W. Jin, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01507H

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