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Figure 8. MOF/MXene composites for REGs. (A) Schematic of MXene/ZIF-8 hybrid membrane preparation and its microstructures. (B) Numerical simulation of ion concentration profile for cations (C_p) and anions (C_n) across 2D channels with varying distances (1.0, 1.4, and 1.8 nm). Reproduced with the permission of Ref.^[111] Copyright © 2022 Wiley-VCH. (C) Schematic of oriented growth of HKUST-1 between MXene layers. Reproduced with the permission of Ref.^[112] Copyright © 2024 Elsevier B.V. (D) Bioinspired design and corresponding schematic of the nano-hierarchical porous MIL-53-COOH/MXene membrane. (E) Steady-state concentration distribution of K⁺ and Cl^- near MIL-53-COOH/MXene hybrid membrane. (F) Steady-state concentration distribution of K⁺ near MIL-53/MXene hybrid membrane and MIL-53-NH₂/MXene hybrid membrane. Reproduced with the permission of Ref.^[113] Copyright © 2024 Elsevier Ltd. (G) Schematic of MXCT membrane preparation process. (H) Schematic of interlayer structures of MXCT. (I) Schematic of the enhanced ion transport across the MXCT membrane via the incorporation of the 2D Cu-TCPP MOFs with rich sub-2 nm ion channels. Reproduced with the permission of Ref.^[114] Copyright © 2024 Elsevier Ltd.