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(a) Photographs of an untreated Al2O3 tube and a tubular COF-LZU1 membrane. (b,c) Cross-sectional SEM images of an untreated Al2O3 tube (b) and a tubular COF-LZU1 membrane (c). (d,e) Top-view SEM images of an untreated Al2O3 tube (d) and a tubular COF-LZU1 membrane (e). Reprinted with permission from [26]. Copyright (2018) John Wiley and Sons publications.
