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Indexed by:期刊论文

Date of Publication:2021-02-02

Journal:CHINESE CHEMICAL LETTERS

Volume:31

Issue:6

Page Number:1665-1669

ISSN No.:1001-8417

Key Words:Exfoliation; MXene; Two-dimensional materials; Water permeability; Water treatment

Abstract:Recent studies have shown impressive transport behaviors of water and ions within lamellar MXene membranes, which endows great promise in developing advanced separation application based high performance MXene membranes. However, most of the researches focused on modification of MXene nanoflakes and optimizing interlayer distance, leaving the impact of membrane fabrication process marginal. In this work, we studied the water flux of membranes made by vacuum filtration using delaminated MXene nanoflakes as the building-blocks. Our results show that the water permeability is extremely sensitive to the process, especially at the drying process, loading and deposit rate of nanoflakes (the feeding concentration). We find that the voids from less ordered stack rather than in-plane defects and interlayer galleries contribute to the large water permeability. The voids can be effectively avoided via deposition of MXene nanoflakes at a slow rate. Manipulating the stack of MXene nanoflakes during vacuum filtration and drying are critical for development of MXene membranes with desired performance for water permeation. (c) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.