2019
DOI: 10.1021/acs.iecr.9b00762
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Investigation of Azo-COP-2 as a Photoresponsive Low-Energy CO2 Adsorbent and Porous Filler in Mixed Matrix Membranes for CO2/N2 Separation

Abstract: Azo-COP-2 is a nanoporous polymer with exceptional CO2/N2 separation performance. In this study, we further investigate the application of Azo-COP-2 as a low-energy CO2 adsorbent and porous filler in mixed matrix membranes (MMMs) for CO2/N2 separation. As an adsorbent, the UV-irradiated Azo-COP-2 showed lower CO2 uptake than in the non-irradiated state and Azo-COP-2 also exhibited highly efficient CO2 photoswitching between the two states. Combined with high CO2/N2 selectivity, this makes Azo-COP-2 an excellen… Show more

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Cited by 21 publications
(9 citation statements)
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“…Among the external stimuli, light is highly efficient, noninvasive, and environmentally friendly. Since the first discovery of the cis-form azobenzene under ultraviolet (UV) light (5), azobenzene has become one of the most widely investigated light-responsive molecular photoswitches between trans and cis isomers (6)(7)(8)(9)(10). The azobenzene derivatives can be converted from trans to cis form upon exposure to ~365-nm UV light, while the reverse cis-to-trans isomerization is achieved under heat or ~450-nm visible (Vis) light irradiation (11,12).…”
Section: Introductionmentioning
confidence: 99%
“…Among the external stimuli, light is highly efficient, noninvasive, and environmentally friendly. Since the first discovery of the cis-form azobenzene under ultraviolet (UV) light (5), azobenzene has become one of the most widely investigated light-responsive molecular photoswitches between trans and cis isomers (6)(7)(8)(9)(10). The azobenzene derivatives can be converted from trans to cis form upon exposure to ~365-nm UV light, while the reverse cis-to-trans isomerization is achieved under heat or ~450-nm visible (Vis) light irradiation (11,12).…”
Section: Introductionmentioning
confidence: 99%
“…From an N-rich Schiff based porous organic framework (SNW-1) which was constructed from melamine and di-aldehydes the derived best PSF-MMMs yielded higher CO 2 and N 2 gas permeabilities than CTF-1@PSF but a similar CO 2 /N 2 selectivity of 29 in single gas measurements (Gao et al, 2014). The CO 2 permeability of 12.7 Barrer and the selectivity of 26 in the 24 wt% CTF-1@PSF MMM is similar or even slightly better to the performance of the azobenzene-based nanoporous polymer, called Azo-COP-2, in a PSF matrix with 14.8 Barrer and a CO 2 /N 2 selectivity of 23 (Li et al, 2019).…”
Section: Resultsmentioning
confidence: 94%
“…The skeleton structure of JJU-1 is initially investigated by Fourier transform infrared (FT-IR) spectroscopy ( Figure 1 a). Through comparison of the FT-IR spectra of initial monomers and final products, the characteristic absorption peaks are summed up as follows: (a) an obvious peak at ~3000 cm –1 is mainly ascribed to the C–H stretching vibration of the hydrogen atom in phenyl ring; (b) the peaks (680~560 cm –1 ) belong to the C–H deformation vibration of four adjacent hydrogen atoms in the 1,2-disubstituted phenyl ring of carbazole group, which are significantly weakened due to the reduction of adjacent ring hydrogen atoms from four to three; (c) some peaks in the range of 800~690 cm –1 are the C–H deformation vibration of ring hydrogen atoms of the 1,2-disubstituted phenyl ring of the carbazole group; (d) the characteristic stretching band of –N=N– at 1445 cm –1 presents in JJU-1 [ 46 ]. Furthermore, the 13 C solid-state NMR was measured to determine the skeleton structure of JJU-1.…”
Section: Resultsmentioning
confidence: 99%