CO2 capture by new ternary nanocomposite LDH/bayerite/Ag2O in tetrametallic NiZnAgAl layered double hydroxides fabricated via in situ growth

Abstract

BACKGROUND

Carbon dioxide exerts the most substantial environmental influence of all greenhouse gases. Therefore, creating novel materials that exhibit minimal energy requirements, robust CO₂ capture efficiency, outstanding adsorption and selectivity, economic viability and rapid scalability for applications in industry is important. This study aimed to fabricate the new ternary nanocomposite LDH/bayerite/Ag₂O in tetrametallic NiZnAgAl layered double hydroxide (LDH) using the hydrothermal method and to investigate its use for efficient CO₂ capture.

RESULTS

The results showed that tetrametallic NiZnAgAl LDH, bayerite and Ag₂O had grown and formed in situ ternary composites in the solid. Various characterization techniques confirmed the presence of tetrametallic NiZnAgAl LDH, bayerite and Ag₂O in the composites. The composites exhibit surface areas ranging from 153.34 to 255.02 m² g⁻¹, pore volumes ranging from 0.19 to 0.26 cm³ g⁻¹ and pore diameters ranging from 4.06 to 4.93 nm. Each composite has a laminar arrangement of stacked flakes, and the surface of the composite is covered with silver oxide. Transmission electron microscopy images exhibit the nano-hexagonal construction of the composites. The selected area electron diffraction profile exhibited congruence with the X-ray diffraction data of LDH, bayerite and Ag₂O. The composites have an average particle size that ranges from 22.79 to 41.84 nm. The ternary composite exhibits CO₂ capture activity with adsorption capacities ranging from 5.88 to 8.29 mmol g⁻¹. We observed that variations in the molar ratios of Ni, Zn and Ag affected the properties of the composites.

CONCLUSION

Overall, the new ternary nanocomposites LDH/bayerite/Ag₂O in tetrametallic NiZnAgAl LDH exhibit promising potential for CO₂ capture applications. © 2024 Society of Chemical Industry (SCI).