| Autor: |
Sedighi, Mina, Azarhoosh, Mohammad Javad, Alamgholiloo, Hassan, Pesyan, Nader Noroozi |
| Zdroj: |
Process Safety and Environmental Protection; October 2024, Vol. 190 Issue: 1 p1481-1493, 13p |
| Abstrakt: |
Ever-increasing atmospheric CO2concentrations has necessitated the development of novel and cost-effective nanostructured composites with favorable physicochemical properties. Recently, the potential of metal-organic framework (MOF)-based nanocomposites towards boosting CO2capture capability has become apparent indicating the importance of the relationship between their structure and properties. Herein, a novel nanocomposite of zinc-based CALF-20 MOF hybridized with graphene oxide is successfully fabricated using the solvothermal method. The construction of the well-structured nanocomposite is confirmed by performing PXRD, BET, FTIR, FESEM/EDX, TEM, and TGA characterization analyses. CO2and N2adsorption capacities and CO2/N2separation performance of these nanocomposites are evaluated by experiment and mathematical modeling for the first time. The CALF-20/GO interfacial interaction and CO2adsorption mechanisms are also discussed. As the best-performing adsorbent, the CALF-20 containing 20 wt% GO indicates a 42.6 % increment in CO2uptake at 1.6 bar and a 32.7 % enhancement in CO2/N2selectivity at 1 bar and 298 K and 1.28 times more CO2retention time in a fixed bed column compared to that of the pristine MOF. The results show that the MOF and GO form chemical bonds at the interface resulting in generating new pore structures and increasing the porosity which are mostly responsible for boosting CO2capture capacity. Interestingly, no meaningful effect is observed by the variation of the zinc atomic concentration at the surface. The simple synthesis procedure and understanding the interfacial structure of the novel CALF-20/GO composite as a promising adsorbent for CO2capture applications can provide new insights for future work. |
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