New quaternary composite <scp>LDH</scp> /bayerite/nitratine/carbon in the hybrid matrix bimetallic <scp>NiAl LDH</scp> /carbon for <scp> CO ₂ </scp> capture

Abstract BACKGROUND Carbon dioxide (CO 2 ) is a leading greenhouse gas whose levels are perpetually rising. Therefore, the development of new innovative materials and economic CO 2 sequestration techniques is a crucial area of research. We fabricated the novel quaternary nanocomposite material comprising bimetallic NiAl LDH, bayerite, nitratine, and carbon via the hydrothermal method. RESULTS The results revealed that the quaternary composite LDH/Bayerite/Nitratine/Carbon formed in the solid. The formation of bayerite on the LDH/carbon matrix due to excess Al 3+ ions under hydrothermal and alkaline conditions. The nitratine species was in situ formed and trapped within the layered structure of LDH. The nitrogen (N 2 ) isotherm adsorption profile for all quaternary composites demonstrated consistency with mesoporous and lamellar features. The quaternary composite surface area ranged from 12.31 to 16.84 m 2 /g, pore diameters ranged from 30.96 to 43.55 nm, and pore volumes from 0.083 to 0.103 cm 3 g −1 . All composites have a layered configuration of superimposed flakes. The average particle size of the composites ranges from 31.92 to 54.02 nm. The composites reveal CO 2 adsorption capacities ranging from 35.18 to 45.73 mmol/g, exceeding those of most other LDH composites. CONCLUSION New quaternary composite demonstrates significant potential for CO 2 sequestration. © 2026 Society of Chemical Industry (SCI).