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<p>This study presents the development and performance evaluation of polyethersulfone (PES)-based mixed-matrix membranes (MMMs) integrated with dolomite for enhanced CO<sub>2</sub>/N<sub>2</sub> separation. Micronized dolomite was calcined at 800&#xa0;°C to increase surface area and subsequently modified with stearic acid to improve hydrophobicity. The MMMs were fabricated via phase inversion with varying dolomite loadings (0–0.75 wt.%), including a 0.5 wt.% hydrophobic variant. Comprehensive membrane characterization was performed using FESEM, FTIR, contact angle analysis, and zetasizer. Gas permeation tests revealed that the incorporation of hydrophilic dolomite improved CO<sub>2</sub> permeability up to an optimal 0.5 wt.%, after which agglomeration hindered performance. Notably, the membrane containing 0.5 wt.% chemically modified hydrophobic dolomite (PES-5) exhibited the highest CO<sub>2</sub>/N<sub>2</sub> selectivity of 8.62, indicating a 57.3% selectivity improvement over pure PES. These values closely approach Robeson’s upper bound, highlighting the filler’s dual role in enhancing selectivity and mitigating water vapor interference via increased hydrophobicity. The results suggest that dolomite, a naturally abundant and cost-effective mineral, can serve as a functional inorganic filler in MMMs, providing a viable pathway for low-cost, high-efficiency CO<sub>2</sub> capture applications.</p> Graphical Abstract <p></p>

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Fabrication and Evaluation of Polyethersulfone Mixed-Matrix Membranes Incorporated with Dolomite for Enhancing CO2/N2 Separation

  • 期刊论文

  • 发表日期：

    2025年9月7日

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  • N. H. M. Amin,
  • M. U. M. Junaidi,
  • A. I. M. Zakaria,
  • N. A. Hashim,
  • H. F. Hizaddin

摘要

This study presents the development and performance evaluation of polyethersulfone (PES)-based mixed-matrix membranes (MMMs) integrated with dolomite for enhanced CO2/N2 separation. Micronized dolomite was calcined at 800 °C to increase surface area and subsequently modified with stearic acid to improve hydrophobicity. The MMMs were fabricated via phase inversion with varying dolomite loadings (0–0.75 wt.%), including a 0.5 wt.% hydrophobic variant. Comprehensive membrane characterization was performed using FESEM, FTIR, contact angle analysis, and zetasizer. Gas permeation tests revealed that the incorporation of hydrophilic dolomite improved CO2 permeability up to an optimal 0.5 wt.%, after which agglomeration hindered performance. Notably, the membrane containing 0.5 wt.% chemically modified hydrophobic dolomite (PES-5) exhibited the highest CO2/N2 selectivity of 8.62, indicating a 57.3% selectivity improvement over pure PES. These values closely approach Robeson’s upper bound, highlighting the filler’s dual role in enhancing selectivity and mitigating water vapor interference via increased hydrophobicity. The results suggest that dolomite, a naturally abundant and cost-effective mineral, can serve as a functional inorganic filler in MMMs, providing a viable pathway for low-cost, high-efficiency CO2 capture applications.

Graphical Abstract