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. 2021 Aug 30;11(9):666. doi: 10.3390/membranes11090666

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

(a) Performance of mixed-matrix membranes containing graphene oxide (GO), showing GO, UiO-66 and UiO-66/GO effect on H₂ permeability and H₂/CH₄ selectivity in Matrimid^® 5218 polymer matrix. Reprinted with permission from ref. [135]. Copyright 2017 Elsevier. (b) An illustration of the GO-laminated membrane intercalated by polyethyleneimine and (c) its H₂/CO₂ performance with reference to the 2008 Robeson upper bound. Reprinted with permission from ref. [139]. Copyright 2016 American Chemical Society. (d) Comparison of the XRD profile and d-spacing between GO membranes and GO membranes intercalated with ethylenediamine (EDA). Reprinted with permission from ref. [140]. Copyright 2018 Elsevier. (e) Effects of two different GO synthesis methods (GO-H, GO synthesized by modified Hummer’s method and GO-B, GO synthesized by modified Brodie’s method) on the d-spacing of the GO sheets and laminated membranes. Reprinted with permission from ref. [141]. Copyright 2019 Royal Society of Chemistry.