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.
Highlights
In recent years, the concentration of carbon dioxide in the atmosphere has been increasing, leading to global warming and climate change
The rest of the metal-organic frameworks (MOFs) characterization measurement including powder X-ray diffractometer (PXRD), N2 and CO2 adsorption isotherms, as well as thermogravimetric analyses can be seen in the supporting information (Figures S2–S22)
Upon successful synthesis of ZIF-8, it was incorporated into the Pebax at varying mixing ratios
Summary
The concentration of carbon dioxide in the atmosphere has been increasing, leading to global warming and climate change. MOFs are used in a wide variety of applications including gas separation [5,6], sensing [7], gas adsorption [8,9], selective catalysis [10,11], ion exchange [12], ultra-high purity separation [13], protein hydrolysis [14], as well as in biological conductive materials, photoelectric materials, new semiconductor materials, magnetic materials and in the field of chip development [15,16,17,18,19]. With this vast array of possibilities, high expectations have been laid on MOFs and its composite materials
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