fig5

Figure 5. (A and B) Rates of ion permeation and the corresponding selectivity of the membranes; (C) Schematic diagram illustrating the selective ion capture by the 3D-COOH-COF; (D) Schematic diagram of 3D-OH-COF. Reproduced with permission from ref^[153], Copyright 2021, American Chemical Society. 3D: Three-dimensional; COF: covalent organic framework.