Fast uptake of low-concentration CO2 on NbOFFIVE-1-Ni/calcium alginate aerogel composites: hierarchical porosity and super stability

An efficient synthesis method for the NbOFFIVE-1-Ni/calcium alginate aerogel composite was reported in this study. The composite material exhibited the combined beneficial properties of both aerogels and MOFs. Calcium alginate, as the carrier of NbOFFIVE-1-Ni, endowed the aerogel with excellent mechanical strength and a synergized macroporous structure with the microporous structure of NbOFFIVE-1-Ni, resulting in a significant synergistic effect. Moreover, the composites exhibited excellent structural properties, including favorable morphology and structure, intact crystal structure, superior thermal stability, mechanical strength, and good cycling stability. The CO 2 adsorption capacity of the aerogel reached 1 mmol/g at a CO 2 concentration of 3000 ppm and a temperature of 298 K. After ten cycles of adsorption and desorption, the efficiency remained stable, indicating the significant potential of the composite for fast uptake of low-concentration CO 2 .