Abstract
The preparation, characterization and gas separation properties of mixed matrix membranes (MMMs) were obtained from polyimide capped with ionic liquid and blended with metal-organic frameworks (MOFs). The synthesized MOF was amine functionalized to produce UiO-66-NH2, and its amino group has a higher affinity for CO2. Mixed matrix membranes exhibited good membrane forming ability, heat resistance and mechanical properties. The polyimide membrane exclusively capped by ionic liquid exhibited good permselectivity of 74.1 for CO2/CH4, which was 6.2 times that of the pure polyimide membrane. It is worth noting that MMM blended with UiO-66-NH2 demonstrated the highest ideal selectivity for CO2/CH4 (95.1) with a CO2 permeability of 7.61 Barrer, which is close to the 2008 Robeson upper bound. The addition of UiO-66-NH2 and ionic liquid enhanced the permselectivity of MMMs, which may be one of the promising technologies for high performance CO2/CH4 gas separation.
Highlights
Concerns about global warming have brought unprecedented public attention on the issue of carbon emissions [1,2,3,4]
Microwave heating is an effective tool in organic chemistry synthesis, but it has recently been used in the synthesis of inorganic and inorganic/organic materials
The surface area of the Brunauer– Emmett–Teller (BET) surface area was 813.25 m2/g, and the pore volume was 0.44 cm3/g, which can contribute to gas permeability
Summary
Concerns about global warming have brought unprecedented public attention on the issue of carbon emissions [1,2,3,4]. Gas separation membrane technology is an effective method. The objective that researchers have been trying to achieve is a membrane material with high permeability and high selectivity. Polymer membranes are the most important commercial membranes for gas separation due to their advantages, which include the ease of membrane formation and low cost. Polymer membranes are usually limited in their equilibrium relationship between selectivity and permeability, which makes it difficult to achieve both simultaneously [14,15]. Robeson applied extensive experimental data to demonstrate the inverse relationship between selectivity and permeability of polymer membranes and defined the Robeson upper bound [16,17]. Common membrane modification methods include thermal rearrangement modification [18,19]; grafting modification [20]; and mixed matrix membranes, etc
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