Highly efficient separation of C1-C3 alkanes and CO2 in carbazole-based nanoporous organic polymers

Construction of a Carbazole-Based Nanoporous Organic Polymer via an AB2 Monomer for Adsorption/Separation of C1–C3 Alkanes and CO2

“…The BET specific surface area (S BET ), microporous surface area, microporous volume, and total pore volume for CNOP-5 are 1425 m 2 •g −1 , 1038 m 2 • g −1 , 0.85 cm 3 •g −1 , and 1.18 cm 3 •g −1 , respectively. The value of S BET obtained for the CNOP-5 polymer exceeds or competes with those of other previously reported carbazole-based nanoporous organic polymers, such as PCNs (393−674 m 2 • g −1 ), 18 CTF-CAR (278 m 2 •g −1 ), 19 CNOPs (769−1546 m 2 • g −1 ), 2,17 CSU-CPOPs (269−1032 m 2 •g −1 ), 20 Car-COFs (721−1334 m 2 •g −1 ), 21 CPOPs (510−1430 m 2 •g −1 ), 22 and In addition, at both temperatures and pressures, the adsorption isotherms for CNOP-5 differ significantly, with gas uptakes uniformly decreasing in the order C 3 H 8 > C 2 H 6 > CO 2 > CH 4 for the four gases. Moreover, we observed that the polarizability and critical temperatures of the four gases are arranged in the same order as their adsorption capacities at both temperatures (Figure S5), indicating that these factors are crucial for gas adsorption.…”

“…As shown in the solidstate 13 C CP/TOSS NMR spectrum of CNOP-5 (Figure 1(c)), the characteristic peak at 190 ppm corresponding to As observed in Figure S3, CNOP-5 is composed of nanoparticles via the FE-SEM images, which is similar to the other reported nanoporous polymers. 2,17 The high-resolution transmission electron microscopy (HR-TEM) images revealed the existence of nanoporous channels in CNOP-5 (Figure S4). We further investigated the pore structure based on the N 2 adsorption and desorption isotherms at 77 K. The N 2 adsorption (filled markers) and desorption (empty markets) isotherms acquired for the CNOP-5 polymers at 77 K are presented in Figure 2(a).…”

“…The BET specific surface area ( S BET ), microporous surface area, microporous volume, and total pore volume for CNOP-5 are 1425 m 2 ·g –1 , 1038 m 2 ·g –1 , 0.85 cm 3 ·g –1 , and 1.18 cm 3 ·g –1 , respectively. The value of S BET obtained for the CNOP-5 polymer exceeds or competes with those of other previously reported carbazole-based nanoporous organic polymers, such as PCNs (393–674 m 2 ·g –1 ), CTF-CAR (278 m 2 ·g –1 ), CNOPs (769–1546 m 2 ·g –1 ), , CSU-CPOPs (269–1032 m 2 ·g –1 ), Car-COFs (721–1334 m 2 ·g –1 ), CPOPs (510–1430 m 2 ·g –1 ), and other types of porous polymers. , Figure (b) illustrates the pore size distribution of CNOP-5 based on nonlocal density functional theory (NLDFT). As displayed in Figure (b), the CNOP-5 polymer has micropores centered at 0.97/1.37 nm and mesopores centered at 3.98 nm.…”

“…CNOP-5 can take up C 3 H 8 and C 2 H 6 of 174.1 and 115.4 cm 3 /g, respectively, at 273 K and 101 kPa, surpassing the previously reported NOPs such as CNOPs (76.8–99.5 and 58.2–76.4 cm 3 ·g –1 ), ANOPs (109.4–134.9 and 78.5–90.2 cm 3 ·g –1 ), and PANs (53.8–143.2 and 44.8–108.1 cm 3 ·g –1 ). ,, Because of physisorption, the four gas uptakes of CNOP-5 exhibited a downward trend with the temperature from 273 to 298 K. As displayed in Table S1, we observed C 3 H 8 and C 2 H 6 capacities of 127.0 and 82.4 cm 3 /g at 101 kPa and 298 K, respectively. These capacities can compete with the previously reported NOPs, as shown in Figure (c), such as CNOPs (62.7–82.1 and 47.2–60.0 cm 3 ·g –1 ), ANOPs (82.4–97.9 and 57.7–64.6 cm 3 ·g –1 ), PANs (43.9–119.0 and 29.1–84.2 cm 3 ·g –1 ), ,, and sPIs (38.8–44.8 and 27.7–35.6 cm 3 ·g –1 ) . Simultaneously, CNOP-5 uptake 48.1 cm 3 /g CO 2 under ambient conditions, which is higher than for sPANs (21.1–24.4 cm 3 /g), PMOPs (40.7–41.5 cm 3 /g), ANOP-M (40.6 cm 3 /g), and 3AM2CL (13.4 cm 3 /g) .…”

Nanoporous semi-cycloaliphatic polyaminal networks for capture of SO2, NH3, and I2

“…Their high porosities, excellent physicochemical stability, and extensive and tunable synthetic methods have captured more attention. [6][7][8][9] Recently, NOPs for SO 2 or NH 3 capture have been reported. [10][11][12][13] The previously reported NOPs were prepared using a post-modication synthetic method, which reveals that the introduction of nitrogen into the material structure improves the capture of SO 2 or NH 3 via electrostatic/acid-base interactions.…”