Mixed Matrix Membranes with Excellent CO₂ Capture Induced by Nano‐Carbon Hybrids

Abstract

1 D multi‐walled carbon nanotube/graphene oxide nanoribbon (MWCNT@GONRs) hybrids were prepared using a chemical method as fillers for Pebax‐based mixed matrix membranes (MMMs) with excellent CO2 separation performance. Herein, the GONRs shell provided a selective barrier and large gas adsorption area, which contributed to enhancement of gas selectivity, while MWCNTs core with smooth internal surface acted as a rapid transport channel, which improved the gas permeability. It is found that MMMs with 1 wt % loading showed the highest separation factor (80 for CO2/N2 and 23 for CO2/CH4) and high CO2 permeability, far surpassing the upper bound line. Therefore, the synergistic effect of the MWCNTs core and GONRs shell in MWCNT@GONRs nanohybrids can effectively enhance the gas‐separation performance of MMMs at low loading. The unique microstructures, ease of synthesis and low filled loading make MWCNT@GONRs promising candidates in post‐combustion and sustainable chemistry.

Pebax Mixed-Matrix Membrane with Highly Dispersed ZIF-8@CNTs to Enhance CO2/N2 Separation

“…As described elsewhere, a constant pressure/variable volume permeation system is used to measure the gas permeation of the membrane. 38 The device is shown in Figure 10. The equation of permeability calculation is as follows…”

Biogas purification by CO2 removal using facilitated transport mechanism of cellulose nanocrystals/polyvinyl alcohol layered hollow fiber membranes

“…The comparison of permeability and selectivity of CO 2 of this work when compared with the other gas separation works is shown in Figure 8. 8,19,20,26,[38][39][40][41][42]45 In this work, the CO 2 permeability achieved for CNC1/PVA at 1169 nm thickness selective layer is 17,858 barrer and selectivity 19. The possible reasons for the higher permeability can be attributed to the high surface area provided using hollow fibers.…”

“…Any polymer/composite membrane utilized for gas separation with its permeability versus selectivity above the Robeson upper bound is conceived to be good for practical application. The comparison of permeability and selectivity of CO 2 of this work when compared with the other gas separation works is shown in Figure 8 8,19,20,26,38–42,45 . In this work, the CO 2 permeability achieved for CNC1/PVA at 1169 nm thickness selective layer is 17,858 barrer and selectivity 19.…”

“…(In order—Legend, composition, (permeability/selectivity) reference ). CNF/PVAm (11.82/41) 37 CA/NH 2 MIL‐53 (36/28.7) 38 CNF/PVA (24.53/39) 8 : Matrimid/AgY (18.62/60.1) 39 CNF/PVAm (50/40) 19 GONR/MWCNT (18/23) 40 PC/PEG (45/41) 41 CNF/PVAm (187/218) 42 CNF/PVA (196/55) 43 AF/MWCNT (957/280) 44 ZIF8/CNF (550/36) 45 CNC/PVA (268/45) 23 CNC/PVA (93/39) 46 CNC/PVA (115/33) 47 CNC/PVA (70/39) 26 CNC/PVA (17,858/19)—this work. [Color figure can be viewed at wileyonlinelibrary.com]…”