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A nanocomposite of multiwalled carbon nanotubes (MWCNTs) and the metal−organic framework MOF-199, denoted as CNT@MOF-199, has been synthesized. It was prepared by the incorporation of multiwalled carbon nanotubes into MOF-199, which exhibits an increased micropore volume, enhanced gas storage capacity, and improved stability compared to MOF-199. The adsorption capacities of gas molecules in MOF-199 and CNT@MOF-199 were found to decrease with increasing temperature, indicating the exothermic nature of the adsorption process. Novel functionalized adsorbents were synthesized by impregnation of various amounts (10, 20, and 30 wt %) of piperazine (PZ)

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