Asymmetric membranes for gas separation: interfacial insights and manufacturing

Al-Kandari, S.; Lightfoot, Jasmine; Castro-Dominguez, Bernardo

doi:10.1039/d3ra00995e

Cited by 4 publications

(1 citation statement)

References 57 publications

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“…The gases were fed at both fixed pressure and variable pressure values at 25 °C, and permeability was evaluated from the steady-state rate of pressure increase at a fixed downstream volume. A detailed description of the procedure and experimental setup is presented …”

Section: Methodsmentioning

confidence: 99%

Recycling and 3D-Printing Biodegradable Membranes for Gas Separation─toward a Membrane Circular Economy

Alkandari,

Ching,

Lightfoot

et al. 2024

ACS Appl. Eng. Mater.

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Polymer membranes employed in gas separation play a pivotal role in advancing environmental sustainability, energy production, and gas purification technologies. Despite their significance, the current design and manufacturing of these membranes lack cradle-to-cradle approaches, contributing to plastic waste pollution. This study explores emerging solutions, including the use of biodegradable biopolymers such as polyhydroxybutyrate (PHB) and membrane recycling, with a focus on the specific impact of mechanical recycling on the performance of biodegradable gas separation membranes. This research represents the first systematic exploration of recycling biodegradable membranes for gas separation. Demonstrating that PHB membranes can be recycled and remanufactured without solvents using hot-melt extrusion and 3D printing, the research highlights PHB’s promising performance in developing more sustainable CO2 separations, despite an increase in gas permeability with successive recycling steps due to reduced polymer molecular weight. The study emphasizes the excellent thermal, chemical, and mechanical stability of PHB membranes, albeit with a marginal reduction in gas selectivity upon recycling. However, limitations in PHB’s molecular weight affecting extrudability and processability restrict the recycling to three cycles. Anticipating that this study will serve as a foundational exploration, we foresee more sophisticated recycling studies for gas separation membranes, paving the way for a circular economy in future membrane technologies.

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Section: Methodsmentioning

confidence: 99%

Recycling and 3D-Printing Biodegradable Membranes for Gas Separation─toward a Membrane Circular Economy

Alkandari,

Ching,

Lightfoot

et al. 2024

ACS Appl. Eng. Mater.

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Supercritical CO2 Treatment of Mixed Matrix Membranes Based on Polyimides for Improvement of Their Gas Transport Properties

Syrtsova,

Alentiev,

Nikolaev

et al. 2024

Membr. Membr. Technol.

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Supercritical CO<sub>2</sub> treatment of mixed matrix membranes based on polyimides for improvement of their gas transport properties

Syrtsova,

Alentiev,

Nikolaev

et al. 2024

Membrany i membrannye tehnologii

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Mixed matrix membranes (MMMs) were prepared by introduction of metal-organic frameworks ZIF-8 and ZIF-67 in concentration up to 20% w/w in chloroform solution intopolyimides synthesized of diethyltoluenediamine (DETDA) isomers mixture and biphenyl-tetracarboxylic acid dianhydride (BPDA)or hexafluoroisopropylidenediphthalic anhydride (6FDA). The initial polyimides were synthesized by single-stage high-temperature catalytic polycondensation in benzoic acid melt. The studied MMMs weretreated by supercritical CO2 with subsequent decompression. The gas transport and gas selective properties of the initial and exposed to sc-CO2 membranes have been studied. Experimental values of the effective gas permeability and diffusion coefficients of He, H2, O2, N2, CO2, CH4 were obtained, and the effective solubility coefficients of these gases were calculated. It was found that the sc-CO2 treatment of the studied MMMs can significantly increase the level of gas permeability of the membranes, while the effect achieved depends on the gas, the nature of the matrix and the concentration of the introduced particles with the selectivity of gases at the level of the initial ones. It has been established that the treatment effect persists over time with a slight decrease in the permeability of gases, which at the same time remains at a level significantly higher than the initial permeability. The demonstrated effect of improving gas transport properties when treating MMMs based on polyimide matrices 6FDA-DETDA and BPDA-DETDA in sc-CO2 can be used for further application of the proposed modification method in order to increase gas transport through MMMs based on other polymers, including highly permeable ones.

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Asymmetric membranes for gas separation: interfacial insights and manufacturing

Abstract: Asymmetric membranes were manufactured via electrohydrodynamic emission, displaying enhanced performance compared to mixed matrix membranes. These membranes leveraged MOF–polymer crystalline interfaces to promote the separation of gas.

Cited by 4 publications

References 57 publications

Recycling and 3D-Printing Biodegradable Membranes for Gas Separation─toward a Membrane Circular Economy

Recycling and 3D-Printing Biodegradable Membranes for Gas Separation─toward a Membrane Circular Economy

Supercritical CO2 Treatment of Mixed Matrix Membranes Based on Polyimides for Improvement of Their Gas Transport Properties

Supercritical CO<sub>2</sub> treatment of mixed matrix membranes based on polyimides for improvement of their gas transport properties

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