Amine‐Functionalized Radiation‐Induced Glycidyl Methacrylate–Grafted Polyamide 6 for CO2 Capture Using Pressure Swing Adsorption

This study presents a method for the preparation of polymeric adsorbents which involves the simultaneous radiation‐induced grafting of glycidyl methacrylate onto Polyamide 6 fibres (GMA‐g‐PA6), followed by the functionalization of the grafted fibres with ethanolamine. The factors, like monomer concentration and radiation dose, which affect the degree of grafting are studied. The prepared polymeric adsorbents were characterized using Fourier‐transform infrared (FTIR), field emission scanning electron microscopy (FE‐SEM), thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The adsorbents were evaluated for CO2 adsorption from a gas mixture of N2 and CO2 containing 5%–15% CO2, using pressure swing adsorption at four different (1, 3, 5 and 7 bar) pressures. The sample with the highest degree of amination has shown maximum adsorption capacity 1.64 mmol g−1 at 7 bar for 15% CO2 concentration at 20°C. The CO2 adsorption on the prepared adsorbents followed a fractional‐order kinetic model. The experimental data aligned effectively with the Freundlich model, reflecting the non‐uniform nature of the adsorbent surface. The regeneration ability of the adsorbent was evaluated over five adsorption–desorption cycles, demonstrating good stability with minimal loss in adsorption capacity. 2025 Society of Chemical Industry and John Wiley & Sons, Ltd.