Year-end Sale % OFF 
Abstract
Currently, finding high capacity adsorbents with large selectivity to capture Xe is still a great challenge. In this work, nitrogen-doped porous carbons were prepared by programmable temperature carbonization of zeolitic imidazolate framework-8 (ZIF-8) and ZIF-8/xylitol composite precursors and the resultant samples are marked as Carbon-Z and Carbon-ZX, respectively. Further adsorption measurements indicate that ZIF-derived nitrogen-doped Carbon-ZX exhibits extremely high Xe capacity of 4.42 mmol g−1 at 298 K and 1 bar, which is higher than almost all other pristine MOFs such as CuBTC, Ni/DOBDC, MOF-5 and Al-MIL-53, and even more than three times of the matrix ZIF-8 at similar conditions. Moreover, Carbon-ZX also shows the highest Xe/N2 selectivity about ~120, which is much larger than all other reported MOFs. These remarkable features illustrate that ZIF-derived nitrogen-doped porous carbon is an excellent adsorbent for Xe adsorption and separation at room temperature.
Highlights
Noble gas xenon plays an important role in human industrial development and has increasingly extensive applications in aspects of lighting[1], medicine[2,3], nuclear magnetic resonance[4] and so on
Metal-organic frameworks (MOFs) and covalent-organic polymers (COPs), as a new class of porous materials, have attracted enormous attention in the field of gas adsorption and separation owing to their tunable pore structures, modified functional groups, multidimensional networks and high porosity & BET surface areas etc[10,11,12,13]
Ben et al.[22,23] found that the fully carbonized PAF-1-450 shows high CO2 capacity of 4.5 mmol g−1 at 273 K and 1 bar, and large selectivity of 209 for a 15/85 CO2/N2 mixture, which was greatly better than the matrix PAF-1, because the carbonization approach can achieve dehydrogenation of phenyl rings in PAF-1, and efficiently decrease the excluded effects of hydrogen atoms of phenyl rings on the gas molecules adsorbed
Summary
Noble gas xenon plays an important role in human industrial development and has increasingly extensive applications in aspects of lighting[1], medicine[2,3], nuclear magnetic resonance[4] and so on. Ben et al.[22,23] found that the fully carbonized PAF-1-450 shows high CO2 capacity of 4.5 mmol g−1 at 273 K and 1 bar, and large selectivity of 209 for a 15/85 CO2/N2 mixture, which was greatly better than the matrix PAF-1, because the carbonization approach can achieve dehydrogenation of phenyl rings in PAF-1, and efficiently decrease the excluded effects of hydrogen atoms of phenyl rings on the gas molecules adsorbed.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
