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Ionization Engineered Two-dimensional Confined Channels in GO Membranes Enable High-efficiency OH- Separation
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  • Yong Li,
  • Rui Jia,
  • Ruonan Tan,
  • Ziqiang Hong,
  • Jingjing Gu,
  • Peng Cui,
  • Suixin Zhang,
  • Hongwei Shao,
  • Jin Ran,
  • Cen-Feng Fu
Yong Li
Hefei University of Technology
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Rui Jia
Hefei University of Technology
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Ruonan Tan
Hefei University of Technology
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Ziqiang Hong
Hefei University of Technology
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Jingjing Gu
Hefei University of Technology
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Peng Cui
Hefei University of Technology
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Suixin Zhang
Hefei University of Technology
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Hongwei Shao
Hefei University of Technology
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Jin Ran
Hefei University of Technology

Corresponding Author:ranjin@hfut.edu.cn

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Cen-Feng Fu
University of Science and Technology of China School of Chemistry and Materials Science
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Abstract

The development of the OH- sieving membranes is of extraordinary importance but challenging for treating alkaline effluents. Here, we propose the ionization engineering concept of two-dimensional (2D) laminated membranes to pursue promising OH- separation. This concept is exemplified via stacking the self-designed sulfonated graphene oxide (SGO) nanosheets to fabricate 2D membranes. The SGO membranes achieve synergetic improvements of OH- dialysis coefficients and separation factors towards the simulated NaOH/Na2WO4 alkaline wastewater in sharp contrast to the 2D GO membranes and the commonly adopted polymeric cation exchange membranes. Besides, the separation factor of the SGO membranes is far higher than most the existing alkali recovery membranes. The molecular dynamics simulation results hint the high-efficiency OH- separation originates from the 2D SGO confined channels, where the dehydration effects and intensified electrostatic repulsion jointly play critical roles. This study offers an alternative strategy to achieve fast OH- sieving by ionizing 2D confined channels.
20 Jun 2023Submitted to AIChE Journal
25 Jun 2023Submission Checks Completed
25 Jun 2023Assigned to Editor
25 Jun 2023Review(s) Completed, Editorial Evaluation Pending
07 Jul 2023Reviewer(s) Assigned
22 Aug 2023Editorial Decision: Revise Major
13 Sep 20231st Revision Received
18 Sep 2023Submission Checks Completed
18 Sep 2023Assigned to Editor
18 Sep 2023Review(s) Completed, Editorial Evaluation Pending
21 Sep 2023Reviewer(s) Assigned
07 Oct 2023Editorial Decision: Revise Minor
15 Oct 2023Submission Checks Completed
15 Oct 2023Assigned to Editor
15 Oct 2023Review(s) Completed, Editorial Evaluation Pending
23 Oct 2023Editorial Decision: Accept