Enhanced O 2 /N 2 separation by QuaternizedMatrimid/Multiwalled carbon nanotube mixed-matrix membrane.

The air separation (O ₂ /N ₂ ) based on polymeric membranes is critical because it is more energy efficient than traditional methods. Dense polymeric membranes are now the main stay of industrial processes that generate oxygen and nitrogen enriched gas. Though, regular polymeric membranes often fall short of selective pressure demands because O ₂ and N ₂ gases have such comparable equivalent diameters. While polymer composites have their benefits, nanocomposite (NCs) allows for the production of high-performance barriers. Utilising Matrimid® 5218 (Matrimid) as the base framework and multiwall carbon nanotube (MWCNT) as the filler, a novel NCs for O ₂ /N ₂ separation was developed. Both matrimid and MWCNTs were chemically modified quaternization and functionalizing the MWCNTs. The membranes were casted using solution casting with a combination of quaternized matrimid and functionalized multi-walled carbon nanotubes ( f -MWCNT). When f -MWCNT was added to quaternized matrimid, it created interfacial compatibility, which increased O ₂ /N ₂ selectivity and permeability by 65 % and 35 %, respectively. In the current study, increasing O ₂ diffusivity and O ₂ /N ₂ solubility selectivity resulted in improved performance, this paves a way for manufacturing innovation.
Competing Interests: Please check the following as appropriate.•All authors have participated in (a) conception and design, or analysis and interpretation of the data; (b) drafting the article or revising it critically for important intellectual content; and (c) approval of the final version.•This manuscript has not been submitted to, nor is under review at, another journal or other publishing venue.•The authors have no affiliation with any organization with a direct or indirect financial interest in the subject matter discussed in the manuscript
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