Fabrication of Functionalized MOFs Incorporated Mixed Matrix Hollow Fiber Membrane for Gas Separation

Abstract

The metal-organic framework (MOFs) of MIL-53 was functionalized by aminosilane grafting and then incorporated into Ultem®1000 polymer matrix to fabricate mixed matrix hollow fiber membrane (MMHFM) with high separation performance. SEM, XRD, and TGA were performed to characterize the functionalized MIL-53 and prepared MMHFM. The filler particles were embedded in membrane successfully and dispersed well in the polymer matrix. The incorporation of MOFs endowed MMHFM better thermal stability. Moreover, effects of solvent ratio in spinning dope, spinning condition, and testing temperature on gas separation performance of MMHFM were investigated. By optimizing dope composition, air gap distance, and bore fluid composition, MMHFM containing functionalized MIL-53 achieved excellent gas permeance and CO2/N2selectivity. The CO2permeance increased from 12.2 GPU for pure Ultem HFM to 30.9 GPU and the ideal CO2/N2selectivity was enhanced from 25.4 to 34.7 simultaneously. Additionally, gas permeance increased but the selectivity decreased with the temperature increase, which followed the solution-diffusion based transport mechanism.

Tailoring CO2/CH4 Separation Performance of Mixed Matrix Membranes by Using ZIF-8 Particles Functionalized with Different Amine Groups

“…Referring to Table 3, the CO 2 permeability and CO 2 /CH 4 selectivity increase while CH 4 permeability decrease for all the resultant mixed matrix membranes compared to pure 6FDA-durene membrane. This could be due to the introduction of amine-functionalized ZIF-8 fillers which increased the inter-segmental spacing between polymer chain near the fillers [33,63]. In addition, it can be observed that the values of µ CO 2 are positive as shown in Table 3, which agree that the incorporation of amine-functionalized ZIF-8 filler enhanced the gas permeability [24].…”

Development of Amine-Functionalized Metal-Organic Frameworks Hollow Fiber Mixed Matrix Membranes for CO2 and CH4 Separation: A Review

“…To overcome these limitations and increase the performance of polymer membranes, inorganic materials are integrated into polymer matrix to form mixed matrix membranes (MMMs). Over the years, several types of conventional inorganic fillers were used in the development of mixed matrix membrane such as zeolites [ 3 ], carbon molecular sieve (CMS) [ 11 ], activated carbon [ 12 ], metal-organic frameworks [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ], carbon nanotubes (CNTs) [ 22 ], metal oxides, mesoporous materials, non-porous material, and lamellar inorganic materials [ 23 ]. Common types of MMMs contains two phases which are the polymer (continuous) phase and a dispersed inorganic phase [ 23 ].…”

“…Metal-organic frameworks (MOFs) are a satisfactory alternative to improve the permeation properties of membranes because of its large surface area, high porosity, adsorption capacity, and good compatibility [ 15 ]. This has led to the utilization of MOFs in numerous applications which include gas/liquid separation, catalysts, medicine, and electronics [ 27 ].…”

“…Yet, filler particle aggregation and interfacial defects are the major drawbacks that hinder the development of MOFs filler based MMMs. Due to accessible metals and ligands used in MOFs synthesis, modified structures can be tailored to enhance the interaction between MOF filler and polymer chains as well as provide exceptional physical and chemical properties [ 15 ]. Therefore, MOFs have become part of the selection of fillers for the development of MMMs for optimizing gas diffusion and selectivity.…”

Prediction of CO2 Permeability in NH2-MIL-53(Al)/Cellulose Acetate Mixed matrix Membranes using Theoretical Models

“…Membrane separation technology is widely used for the removal of CO 2 compared to conventional typical technologies it offers advantages such as smaller foot print and less energy consumption [7]. Among the various membrane materials, mixed matrix membranes (MMMs) are widely reported for CO 2 separation because of their superior characteristics such as low cost and higher separation performance [8].…”