Fig. 4: Ion permselectivity of CMOF composite membranes. | Nature Communications

Fig. 4: Ion permselectivity of CMOF composite membranes.

From: Biomimetic KcsA channels enabled by 1D MOF-in-2D COF

Fig. 4

a Cation diffusion behavior of the TAPA-TFP-0.25-NH2-CuBDC CMOF composite membrane (COFs: 1 mM TAPA + 1 mM TFP, linear fitting is employed, and the R2 values for KCl, NaCl, LiCl, and MgCl2 plots are 0.999, 0.995, 0.979 and 0.996 respectively). Ion permeation rate (b) and single-ion selectivity (c) of TAPA-TFP-x-NH2-CuBDC CMOF composite membranes (COFs: 1 mM TAPA + 1 mM TFP, x = 0.25, 0.5, 1, 5). d Cation diffusion behavior of the TAPA-TFP-0.5-NH2-CuBDC CMOF composite membrane (COFs: 0.5 mM TAPA + 0.5 mM TFP, linear fitting is employed, and the R2 values for KCl, NaCl, LiCl, and MgCl2 plots are 0.994, 0.999, 0.999 and 0.998 respectively.). Ion permeation rate (e) and single-ion selectivity (f) of TAPA-TFP-x-NH2-CuBDC CMOF composite membranes (COFs: 0.5 mM TAPA + 0.5 mM TFP, x = 0.25, 0.5, 1, 5). g Comparison of the K+ permeation rate and ideal selectivity among membranes with various channel configurations. Information on the data points is given in Supplementary Table 6. h Normalized K+ permeation rate and K+/Na+ selectivity of TAPA-TFP-0.25-NH2-CuBDC CMOF composite membrane (COFs: 1 mM TAPA + 1 mM TFP) under different concentration gradients in the single-ion system. i Radar plot comparing the physicochemical properties and ion-sieving performance of TAPA-TFP-0.25-NH2-CuBDC CMOF (COFs: 1 mM TAPA + 1 mM TFP) and 0.25-NH2-CuBDC-TAPA-TFP MCOF composite membranes.

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