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Bioinspired Macrocyclic Molecule Supported Two-Dimensional Lamellar Membrane with Robust Interlayer Structure for

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Summary

This study introduces a novel 2D lamellar membrane (2DLM) using MXene and cucurbit[5]uril for enhanced nanofiltration. The new membrane shows excellent stability and performance in water purification and ion enrichment.

Keywords:
MXenemembrane separationnanofiltrationsize sievinguranium enrichment

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Environmental Engineering

Background:

  • 2D lamellar membranes (2DLMs) are crucial for desalination and nanofiltration but suffer from swelling due to weak inter-sheet interactions.
  • This swelling limits their practical application in water treatment and separation processes.

Purpose of the Study:

  • To develop a highly stable 2DLM by addressing the swelling issue in conventional membranes.
  • To demonstrate the efficacy of this new membrane for challenging separation tasks like methyl blue nanofiltration and uranyl carbonate enrichment.

Main Methods:

  • Construction of a 2DLM using Ti3C2Tx MXene functionalized with cucurbit[5]uril (CB5).
  • Utilized density functional theory (DFT) calculations to understand the binding interactions between CB5 and MXene.
  • Performed nanofiltration experiments with methyl blue and selective enrichment of uranyl carbonate from various water matrices.

Main Results:

  • The novel 2DLM demonstrated exceptional nanofiltration performance with high permeance (69 L m-2 h-1 bar-1) and methyl blue rejection (93.6%).
  • The membrane exhibited remarkable swelling resistance, even in high salinity conditions, and maintained performance over 30 recycling cycles.
  • Successful selective enrichment of uranyl carbonate from artificial and natural seawater was achieved, showcasing its potential for resource recovery.

Conclusions:

  • The integration of cucurbit[5]uril with MXene provides a robust strategy for creating stable 2DLMs with tunable interlayer spacing.
  • This approach significantly enhances membrane stability against swelling, enabling efficient and durable applications in molecular sieving, nanofiltration, and ion separation.
  • The developed 2DLM offers a promising solution for advanced water treatment and selective ion recovery from complex aqueous environments.