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<p>CO<sub>2</sub> separation from N<sub>2</sub> and CH<sub>4</sub> is increasingly important due to environmental and industrial concerns. Membrane-based separation using polymeric materials offers advantages such as energy efficiency, easy processing, and cost-effectiveness. In this study, mixed matrix membranes (MMMs) based on CO<sub>2</sub>-philic Pebax 2533 were fabricated and modified in two steps to enhance CO<sub>2</sub> separation performance. In the first step, Sorbitol was incorporated at various loadings (5–20 wt%), with 15 wt% found to be optimal, achieving CO<sub>2</sub> permeability of 394.5 Barrer and selectivities of 13.11 (CO<sub>2</sub>/CH<sub>4</sub>) and 48.70 (CO<sub>2</sub>/N<sub>2</sub>) at 30&#xa0;°C and 2&#xa0;bar. Sorbitol enhanced membrane crystallinity and thermal stability, as confirmed by FTIR, DSC, and TGA. In the second step, Ag nanoparticles (AgNPs) were introduced (up to 5 wt%) into the Pebax/Sorbitol matrix to exploit facilitated CO<sub>2</sub> transport mechnisem. FESEM showed changes in morphology and increased chain rigidity. The optimized membrane (P/S-15/Ag-5) exhibited a 19.5% increase in CO<sub>2</sub> permeability compared to P/S-15, while maintaining the selectivities. The combined effect of Sorbitol and AgNPs led to improved thermal and separation properties, making the developed MMMs promising candidates for efficient CO<sub>2</sub> separation applications.</p>

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Dual synergistic modification of Pebax 2533 membranes with sorbitol and silver nanoparticles for enhanced CO2 separation efficiency

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月25日

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  • Hossein Hassanzadeh,
  • Reza Abedini,
  • Mohsen Ghorbani

摘要

CO2 separation from N2 and CH4 is increasingly important due to environmental and industrial concerns. Membrane-based separation using polymeric materials offers advantages such as energy efficiency, easy processing, and cost-effectiveness. In this study, mixed matrix membranes (MMMs) based on CO2-philic Pebax 2533 were fabricated and modified in two steps to enhance CO2 separation performance. In the first step, Sorbitol was incorporated at various loadings (5–20 wt%), with 15 wt% found to be optimal, achieving CO2 permeability of 394.5 Barrer and selectivities of 13.11 (CO2/CH4) and 48.70 (CO2/N2) at 30 °C and 2 bar. Sorbitol enhanced membrane crystallinity and thermal stability, as confirmed by FTIR, DSC, and TGA. In the second step, Ag nanoparticles (AgNPs) were introduced (up to 5 wt%) into the Pebax/Sorbitol matrix to exploit facilitated CO2 transport mechnisem. FESEM showed changes in morphology and increased chain rigidity. The optimized membrane (P/S-15/Ag-5) exhibited a 19.5% increase in CO2 permeability compared to P/S-15, while maintaining the selectivities. The combined effect of Sorbitol and AgNPs led to improved thermal and separation properties, making the developed MMMs promising candidates for efficient CO2 separation applications.