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Molecule transfer mechanism in 2D heterostructured lamellar membranes: The effects of dissolution and diffusion
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  • Chongchong Chen,
  • Xiaoli Wu,
  • Jie Zhang,
  • Jingjing Chen,
  • Xulin Cui,
  • Wenpeng Li,
  • Wenjia Wu,
  • jingtao wang
Chongchong Chen
Zhengzhou University
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Xiaoli Wu
Zhengzhou University
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Jie Zhang
Zhengzhou University
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Jingjing Chen
Zhengzhou University
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Xulin Cui
Zhengzhou University
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Wenpeng Li
Zhengzhou University
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Wenjia Wu
Zhengzhou University
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jingtao wang
Zhengzhou University
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Abstract

Two-dimensional (2D) lamellar membranes are promising for efficient molecule transfer, while the underlying molecule transfer mechanism is rarely elucidated. Herein, heterostructured nanosheets are prepared by self-assembling small-sized hydrophilic cyanuric acid melamine (CMN) and hydrophobic g-C3N4 nanosheets. The resultant lamellar membranes show comparable affinity to both polar and nonpolar solvents, allowing them to dissolve on membrane surface and diffuse through membrane channels. Permeance results demonstrate that the transfer of polar solvents is controlled by dissolution and diffusion processes, while that of nonpolar solvents is governed by dissolution process. And the corresponding equations are established. Importantly, polar solvents are induced to form ordered arrangement in hydrophilic nanodomains and then maintain this state in hydrophobic nanodomains, affording low-resistance transfer thus high permeance: 1025 L m-2 h-1 bar-1 for acetonitrile. In contrast, nonpolar solvents with disordered arrangement acquire lower permeance than that of polar ones, but with comparable diffusion ability in these membranes.

Peer review status:UNDER REVIEW

28 Jul 2021Submitted to AIChE Journal
03 Aug 2021Assigned to Editor
03 Aug 2021Submission Checks Completed
07 Aug 2021Reviewer(s) Assigned