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The presence of spiky and spherical CuO NPs on the zeolite surface resulted in increases of 112% and 86% in the amount of chemisorbed CO 2 on the zeolite-Y surfaces, respectively. This enhancement is mainly due to the higher CO 2 chemisorption capability of CuO NP-zeolite systems compared to that of bare zeolite. Quantitative analyses demonstrated that CuO NPs in both morphologies on the zeolite surface led to an improvement in their CO 2 adsorption capacities. The microscopy analyses showed that spiky nanostructures have a length of approximately 450 nm, and the spherical ones are approximately 18 nm in diameter.
The properties and CO 2 adsorption performances of the hybrid systems were characterized by transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, atomic absorption spectroscopy, and Brunauer-Emmett-Teller analyses. Copper(II) oxide (CuO) nanoparticles (NPs) in two different morphologies, spiky and spherical, were synthesized on zeolite-Y by a modified impregnation method, and their CO 2 adsorbing capabilities were investigated under standard conditions (1 atm and 298 K).
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