Combined Effect of CNTs with ZIF-302 into Polysulfone to Fabricate MMMs for Enhanced CO2 Separation from Flue Gases

Polysulfone Composite Membranes with Carbonaceous Structure. Synthesis and Applications

“…The composite containing 12 wt.% ZIF-302 and 8 wt.% CNT recorded an optimal separation performance by providing a CO 2 permeability of 18 Barrer with a CO 2 /N 2 selectivity of 35. There was a slight improvement in MMM permeability in wet conditions compared to dry conditions [59]. PSF/CNT-type functionalized with -COOH, -CONH 2 , -N 3 groups composite membranes obtained through phase inversion method have been shown to have unique properties in terms of surface characteristics and metal ions selective separation from water.…”

“…Increase the water flux from 60% to 100%; improve resistance to protein fouling; increase the hydrophilicity of the membrane surface [31] Carboxylated MWCNT Increase the tensile strength; improve membrane permeability and surface hydrophilicity; decreased retention and increase leaching [32] Amine functionalized MWCNT Improve surface hydrophilicity; increased by 160% the water permeability and present a rejection of NaCl solution between 0.01-0.1 wt.% [33,41] MWCNT Improve thermal stability; increase the dielectric constant and dielectric loss [34,69] Raw CNT and oxidized CNT Increase the pore size of the top surface; increase the pure water flux by 2 times; lower thermal stability and mechanical strength; high rejection capacity for 2-naphthol solution [35] CNT doped with N and P Improvement in hydrophilicity, thermal stability and water uptake capacity; better flow permeation and selectivity; improve the fouling properties by 30% [37] Carbon nanofibre Improve membrane thermostability; increase the dielectric constant [38] MWCNT Improve tensile strength and modulus; increase materials crystallinity and thermostability [44,46] Ag doped CNT Improvement of fouling resistance during BSA solution filtration; slight decrease of water flux with an increase of stability during compaction [47] C60 Increase thermal stability and optics properties [48] Dodecylamine functionalized MWCNT Increase membrane surface hydrophilicity; improve the fouling resistance and flux recovery [51] SWCNT and DWCNT modified with amine groups Increase the adsorption capacity of Pb 2+ [52] Carbon nanoparticles Decrease membrane porosity and permeability; increase hydrophilicity and tensile properties; increase benzene absorption capacity [53] MWCNT and TiO 2/ Increase the permeability of the membrane using humic acid as feed solution [55] Amine functionalized carbon fibers Extraordinary separation capacity for CO 2 -CH 4 and N 2 -O 2 [56] SWCNT and MWCNT Improved the anti-biofouling properties using E.coli cultures [57] MWCNT and zeolitic imidazole frameworks improvement in CO 2 permeability of composite membranes by three times [59] CNT functionalized with -COOH, -CONH 2 , -N 3 groups Increased permeability to ~600 L•m −2 •h −1 (LMH); better rejection of Cu (II) than Pb (II) [60] Carbon nanofibers Increase membrane permeability from 12.134 Barres to 12.04 and selectivity [62] Table 1. Cont.…”

Recent Advances in Polymer-Inorganic Mixed Matrix Membranes for CO2 Separation

“…Different types of inorganic fillers including ZIFs have been reported in recent reviews [ 22 , 120 , 121 , 122 ]. Typical ZIFs such as ZIF-7, ZIF-8, ZIF-11, ZIF-67, ZIF-71, ZIF-90, ZIF-95, ZIF-301, ZIF 302, etc., have been fabricated as sole ZIF MMMs [ 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 ] or modified ZIF MMMs [ 95 , 126 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 , 150 , 151 , 152 , 153 , 154 , 155 , 156 , 157 , 158 , 159 , 160 ] for different gas separation applications, such as for CO 2 /CH 4 , CO 2 /N 2 , H 2 /CH 4 , C 3 H 6 /C 3 H 8 , etc. For example, Guan et al highlighted recent research progress in ZIF-based MMMS for CO 2 separation [ 118 ].…”

“…In order to improve gas molecule transportation in the membrane matrix between ZIFs and polymers, ZIF hybrids—a combination of ZIFs with other inorganic fillers (e.g., SWCNTs, MWCNTs, GO, SiO 2 , etc. )—were developed and used as fillers for gas separation [ 125 , 126 , 145 , 146 , 147 , 148 , 149 , 150 , 152 , 153 , 157 , 159 ]. Li et al developed novel MMMs by incorporating ZIF-8, in situ-inserted by MWCNTs, into a Pebax 1657 membrane matrix [ 150 ].…”

“…In order to improve gas molecule transportation in the membrane matrix between ZIFs and polymers, ZIF hybrids-a combination of ZIFs with other inorganic fillers (e.g., SWCNTs, MWCNTs, GO, SiO 2 , etc. )-were developed and used as fillers for gas separation [125,126,[145][146][147][148][149][150]152,153,157,159] Recently, 2-D nanoporous nanosheets have attracted significant attention due to their beneficial features associated with lower diffusion resistance and large external surface area, the latter of which allows the exposure of more active sites. The 2-D ZIFs are a new kind of ZIF, with a cushion-shaped cavity between the layers that has dimensions of 0.94 nm × 0.7 nm × 0.53 nm and a leaf-shaped structure (named ZIF-L in Figure 8; reported and prepared by Chen et al) [161].…”