Carbon Dioxide Enrichment PEBAX/MOF Composite Membrane for CO2 Separation

Abstract

Zeolitic imidazole framework (ZIF-8) was incorporated into poly(ether-block-amide) (Pebax-1657) in differing ratios to prepare mixed matrix membranes (MMMs) for gas separation. As ZIF-8 loading is increased, gas separation selectivity also gradually increases. For economic considerations, the proportion of the increase in selectivity to the amount of MOF loaded per unit was calculated. The results show that mixing 5% MOF gives the best unit performance. With this, a variety of MOFs (UiO-66, UiO-66-NH2, A520, MIL-68(Al) and MIL-100(Fe)) were mixed with PEBAX at 5 loading to prepare MMMs. In this work, metal-organic frameworks (MOFs) were processed using the dry-free method, where in the synthesized MOF was not dried prior to incorporation. The gas separation performance test carried out shows the highest separation performance was exhibited by P-UiO-66, wherein the CO2/N2 gas selectivity was 85.94, and the permeability was 189.77 (Barrer), which was higher than Robeson’s Upper bound in 2008, and obtained a high permeability and selectivity among mixed matrix membranes. In the preparation of high quality MMMs for gas separation, details regarding the interface phenomenon were assessed.

Metal–Organic Frameworks (MOFs)‐Based Mixed Matrix Membranes (MMMs) for Gas Separation: A Review on Advanced Materials in Harsh Environmental Applications

“…successfully developed MIL‐68(Al) and MIL‐100(Fe) based MMMs in PEBAX matrix. [ 40 ] MIL‐68 has a 1D chain structure where there is only one channel allowing permeates to pass through. The MIL‐68(Al) MMMs showed a slightly lower CO 2 permeability than MIL‐100(Fe) MMMs which had a 3D chain structure that allowed more gas to penetrate.…”

“…MILs derivatives, namely MIL‐53(Al), MIL‐68(Al), MIL‐100(Al), MIL‐100(Fe), MIL‐101(Cr), and MIL‐125(Ti) based MMMs will be comprehensively discussed in this section. [ 1,38–40,67,68,70–75 ] MIL‐53(Al) consists of aluminium clusters and a terephthalate‐based linker. It has diamond shape pore apertures that contribute to large pore volume and high surface area.…”

“…reported a low loading of ZIF‐8 in PEBAX and contributed to CO 2 permeability of 195 Barrer and CO 2 /N 2 selectivity of 51.5. [ 40 ] They found that MMMs prepared with dry‐free MOFs showed better particle dispersion without agglomeration. In another study, Lee et al.…”

“…The optimum fillers loading reported from the literature are in the range of 5 wt% to 30 wt% depending on the type of MOFs. [ 36–42 ]…”

Novel Mixed Matrix Membranes Based on Polymer of Intrinsic Microporosity PIM-1 Modified with Metal-Organic Frameworks for Removal of Heavy Metal Ions and Food Dyes by Nanofiltration

“…In addition, the introduction of MOFs into a polymer membrane significantly affects the hydrophilic-hydrophobic balance of the surface, sorption characteristics, and free volume of the polymer film due to the porous structure of MOFs. Mixed matrix membranes, where MOFs are a modifier, are used in such membrane processes as nanofiltration [31][32][33], ultrafiltration [34][35][36], pervaporation [37,38], and gas separation [39,40].…”