• • The GO-SPABS membrane achieves enhanced CO2/N2 separation performance under humidified conditions, leveraging Na+ and sulfonic acid groups as CO2-philic active sites, with a large-area membrane (15 cm × 20 cm) fabricated by blade-casting showing reproducible results.
• • The multifunctional molecule SPABS enables uniform Na+ intercalation via nucleophilic addition between amino groups and epoxy groups on GO, ensuring stable interlayer channels and preventing aggregation, which is critical for consistent membrane performance.
• • The hydrophilic sulfonic acid groups increase water adsorption in the interlayer, synergizing with Na+ to facilitate facilitated transport of CO2 over N2, leading to high selectivity and permeability, though exact values are not provided in the abstract.
• • The scalable blade-casting method for large-area membranes (15 cm × 20 cm) demonstrates potential for industrial scale-up, addressing a key bottleneck in 2D material membrane fabrication.