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Facile synthesis and exfoliation of micro-sized LDH to fabricate 2D membranes towards Mg/Li separation
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  • Biao Li,
  • Juanjuan Peng,
  • Menghan Li,
  • Zeya Yang,
  • Jun Lu,
  • Jingbin Han
Biao Li
Beijing University of Chemical Technology
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Juanjuan Peng
Beijing University of Chemical Technology
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Menghan Li
Beijing University of Chemical Technology
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Zeya Yang
Beijing University of Chemical Technology
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Jun Lu
Beijing University of Chemical Technology
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Jingbin Han
Beijing University of Chemical Technology

Corresponding Author:hanjb@mail.buct.edu.cn

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Abstract

Two-dimensional (2D) membranes have demonstrated potential for molecular separation; however, their applicability for Li/Mg ion separation has been restricted by their negatively-charged and easily-swellable properties in water. Moreover, their practical application has been hindered by the challenge of producing significant quantities of single-layer nanosheets. To overcome these challenges, we have developed a scalable method for synthesizing micro-sized nitrate ZnAl layered double hydroxide (LDH) and subsequent exfoliating to yield monolayer nanosheets for the construction of 2D membranes. The sub-nanometer channels of the LDH membrane is positively charged, which prevents the passage of magnesium ions. These channels also impede the flow of magnesium ions that are more difficult to dehydrate. As a result, the LDH membranes exhibit robust lithium-magnesium separation ability, with a separation ratio of 6 (Li/Mg). This work provides a method for producing high-quality LDH nanosheets and validates the enormous potential of LDH membranes in the field of lithium-magnesium separation.
11 Apr 2023Submitted to AIChE Journal
11 Apr 2023Review(s) Completed, Editorial Evaluation Pending
11 Apr 2023Submission Checks Completed
11 Apr 2023Assigned to Editor
13 Apr 2023Reviewer(s) Assigned
25 May 2023Editorial Decision: Revise Major
08 Jun 20231st Revision Received
18 Jun 2023Submission Checks Completed
18 Jun 2023Assigned to Editor
18 Jun 2023Review(s) Completed, Editorial Evaluation Pending
20 Jun 2023Reviewer(s) Assigned
18 Jul 2023Editorial Decision: Accept