Designing GO Channels with High Selectivity for CO₂/N₂ Separation via Incorporating Metal Ions

Abstract

Graphene oxide (GO) membranes holds great potential for high‐performance CO2 capture. Aiming at enhancing the CO2 separation performance and structural stability of GO membranes, functionalizing GO channels with metal ions confers a promising strategy. In this study, we reported the fabrication of metal ion‐incorporated GO membranes with remarkably improved CO2/N2 separation performance. The metal ions within GO channels contribute to facilitating CO2 transport, decreasing N2 solubility, hindering N2 diffusion, and form multiple interactions with GO nanosheets. After introducing Mg2+ ions, the CO2/N2 separation factor of GO membrane is remarkably increased from 4 to 48.8 with the CO2 permeance increases 1.5 times. Moreover, the separation performance of the GO‐Mg2+ membranes shows an excellent long‐term stability owing to the structural robustness. This study could provide insights into the regulation of the microstructure of metal ion‐functionalized GO membranes for highly selective transport of specific molecules.

Graphene Oxide and Metal–Organic Framework-Based Breathable Barrier Membranes for Toxic Vapors

“…35 By intercalating Fe ions in mildly reduced GO (rGO)-based gas separation membranes, 36 an excellent N 2 / CO 2 selectivity of ∼97 was obtained at 110 mbar. After introducing Mg 2+ ions within GO channels, 37 the CO 2 /N 2 separation factor of the GO membrane is remarkably increased from 4 to 48.8 with CO 2 .…”

Defect Engineering in GO Membranes – Tailoring Size and Oxidation Degree of Nanosheet for Enhanced Pore Channels

“…[19][20][21] Pore formation, chemical reduction, and size control are also employed to improve the membrane's permeability. [22][23][24] Among these methods, controlling the lateral size of graphene oxide (GO) nanosheets has proven effective. Wang et al conducted a study where they optimized a two-dimensional membrane by reducing the GO layers to smaller sizes.…”

“…These techniques encompass the incorporation of supplementary nanomaterials like carbon nanotubes, graphene nanoribbons, and MXene [19–21] . Pore formation, chemical reduction, and size control are also employed to improve the membrane‘s permeability [22–24] . Among these methods, controlling the lateral size of graphene oxide (GO) nanosheets has proven effective.…”