Lee, Woo Ram Hwang, Sang Yeon Ryu, Dae Won Lim, Kwang Soo Han, Sang Soo Moon, Dohyun Choi, Jungkyu Hong, Chang Seop 2024-01-20T10:32:48Z 2024-01-20T10:32:48Z 2021-09-05 2014-02 1754-5692 https://pubs.kist.re.kr/handle/201004/127178 A framework en-Mg-2(dobpdc) (1-en; en = ethylenediamine) functionalized with the primary amine en was prepared via postmodification. From synchrotron PXRD data, it is revealed that the cell parameters change upon grafting of en and CO2 uptake. The adsorbed CO2 amount of 1-en is 4.57 mmol g(-1) (16.7 wt%) at 25 degrees C and 1 bar and decreases to 3.00 mmol g(-1) (11.7 wt%) at 150 degrees C. Noticeably, 1-en shows a significant CO2 uptake (3.62 mmol g(-1), 13.7 wt%) at 0.15 bar, which is comparable to the CO2 partial pressure of a post-combustion flue gas. The CO2 capacity of 1-en at 0.39 mbar, close to atmospheric CO2 concentration, is 2.83 mmol g(-1) (11.1 wt%), which marks the highest amount among MOFs. The isosteric heat of adsorption (-Q(st)) of 1-en in CO2 capture corresponds to 49-51 kJ mol(-1), which is supported by DFT calculations (-52.8 kJ mol(-1)). These results suggest that the adsorption of CO2 onto the free amines of en leads to the formation of a carbamic acid. Adsorption-desorption cyclings of CO2 at the real dilute concentrations of air and flue gas are established with almost retaining CO2 capacities, which could provide superior potential for practical application in CO2 capture. The adsorption rate of CO2 in 1-en exceeds that in some other tested porous materials. The recyclability in CO2 uptake for 1-en is maintained even after exposure to humidity. English Royal Society of Chemistry CARBON-DIOXIDE CAPTURE MOLECULAR BASKET SORBENT CO2-INDUCED DEGRADATION MESOPOROUS SILICA SORPTION ADSORBENT POLYMER AMINES Diamine-functionalized metal-organic framework: exceptionally high CO2 capacities from ambient air and flue gas, ultrafast CO2 uptake rate, and adsorption mechanism Article 10.1039/c3ee42328j 1 Energy & Environmental Science, v.7, no.2, pp.744 - 751 Energy & Environmental Science 7 2 744 751 scie scopus 000331413700029 2-s2.0-84893136049 Chemistry, Multidisciplinary Energy & Fuels Engineering, Chemical Environmental Sciences Chemistry Energy & Fuels Engineering Environmental Sciences & Ecology Article CARBON-DIOXIDE CAPTURE MOLECULAR BASKET SORBENT CO2-INDUCED DEGRADATION MESOPOROUS SILICA SORPTION ADSORBENT POLYMER AMINES Metal-organic framework CO2 Adsorption