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<p>The increasing concentration of atmospheric CO<sub>2</sub> has intensified the demand for efficient adsorption materials. In this study, a bacterial cellulose (BC)-based composite was derived from Nata de coco waste originating from industrial production in Thailand, thereby contributing to both CO<sub>2</sub> adsorption and waste utilization. The BC-based composite was functionalized with amino-modified zeolitic imidazolate framework-8 (ZIF-8-NH<sub>2</sub>) via an in-situ synthesis to form hierarchical porous structures. Further enhancement was achieved by grafting (3-aminopropyl) triethoxysilane (APTES) into the unreacted hydroxyl groups (–OH), which were incompletely covered by ZIF-8, to increase CO<sub>2</sub> adsorption capacity. Structural and adsorption characterizations revealed that the ZIF-8-NH<sub>2</sub>/BC composite exhibited a CO<sub>2</sub> adsorption capacity of 1.64 ± 0.02&#xa0;mmol/g, which was significantly higher than that of pristine BC (0.21 ± 0.02&#xa0;mmol/g). Subsequently, the optimal concentration of APTES grafting increased this capacity to 1.92&#xa0;mmol/g ± 0.02&#xa0;mmol/g at 0&#xa0;°C. The optimized composite demonstrated a CO<sub>2</sub>/N<sub>2</sub> selectivity of approximately 15 and maintained adsorption efficiency over five cycles, indicating robust recyclability. This work highlights the potential of APTES-functionalized ZIF-8-NH<sub>2</sub>/BC composite as sustainable and efficient CO<sub>2</sub> adsorbents.</p> Graphical abstract <p></p>

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Integrating APTES on hierarchical ZIF-8-NH2/bacterial cellulose aerogel for efficient CO2 adsorption

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Phuwadol Pornsawangwat,
  • Bhumin Than-ardna,
  • Hathaikarn Manuspiya

摘要

The increasing concentration of atmospheric CO2 has intensified the demand for efficient adsorption materials. In this study, a bacterial cellulose (BC)-based composite was derived from Nata de coco waste originating from industrial production in Thailand, thereby contributing to both CO2 adsorption and waste utilization. The BC-based composite was functionalized with amino-modified zeolitic imidazolate framework-8 (ZIF-8-NH2) via an in-situ synthesis to form hierarchical porous structures. Further enhancement was achieved by grafting (3-aminopropyl) triethoxysilane (APTES) into the unreacted hydroxyl groups (–OH), which were incompletely covered by ZIF-8, to increase CO2 adsorption capacity. Structural and adsorption characterizations revealed that the ZIF-8-NH2/BC composite exhibited a CO2 adsorption capacity of 1.64 ± 0.02 mmol/g, which was significantly higher than that of pristine BC (0.21 ± 0.02 mmol/g). Subsequently, the optimal concentration of APTES grafting increased this capacity to 1.92 mmol/g ± 0.02 mmol/g at 0 °C. The optimized composite demonstrated a CO2/N2 selectivity of approximately 15 and maintained adsorption efficiency over five cycles, indicating robust recyclability. This work highlights the potential of APTES-functionalized ZIF-8-NH2/BC composite as sustainable and efficient CO2 adsorbents.

Graphical abstract