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Investigation of mixed matrix membranes of graphene and acid-treated graphene fillers in cellulose acetate and polyetherimide polymers for CO2 separation from biogas

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dc.contributor.author Kuncharam, Bhanu Vardhan Reddy
dc.date.accessioned 2025-04-09T04:19:36Z
dc.date.available 2025-04-09T04:19:36Z
dc.date.issued 2024-10
dc.identifier.uri https://4spepublications.onlinelibrary.wiley.com/doi/full/10.1002/pen.26985
dc.identifier.uri http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18577
dc.description.abstract Gas separation membranes are crucial for upgrading biogas by separating carbon dioxide (CO2) from biogas, thereby enhancing its calorific value and reducing greenhouse gas emissions. This study aims to improve CO2/CH4 separation using mixed-matrix membranes (MMMs) by incorporating graphene (Gr) and acid-treated graphene (AGr) fillers in a cellulose acetate (CA) polymer matrix. Similarly, polyetherimide (PEI) MMMs were also prepared with Gr and AGr fillers to draw a comparison. Various characterization techniques, including Fourier transform infrared spectroscopy, differential scanning calorimetry, field emission scanning electron microscopy, Raman spectroscopy, and X-ray diffraction, were employed to investigate the structural and morphological properties of the membranes and fillers. Gas permeation tests using a model biogas mixture (40% CO2 and 60% CH4) revealed that the 0.1%AGr/CA membrane achieved the highest CO2 permeability of 43 Barrers, which is approximately 307% more than that of the pure CA membrane, and showed a CO2/CH4 selectivity of 14.80. The 0.5%Gr/PEI membrane demonstrated the best performance among PEI-based MMMs, with a CO2 permeability of 17.48 Barrers and a CO2/CH4 selectivity of 8.96. These results indicate that the incorporation of Gr and AGr significantly enhances the gas separation performance over pure CA and PEI membranes. en_US
dc.language.iso en en_US
dc.publisher Wiley en_US
dc.subject Chemical engineering en_US
dc.subject Biogas en_US
dc.subject Mixed-matrix membranes (MMMs) en_US
dc.subject Spectroscopy en_US
dc.title Investigation of mixed matrix membranes of graphene and acid-treated graphene fillers in cellulose acetate and polyetherimide polymers for CO2 separation from biogas en_US
dc.type Article en_US


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