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<p>To address the growing issue of the greenhouse effect, CO<sub>2</sub> capture has emerged as a key area of research. In this paper, zeolite imidazolium salt framework-8 (ZIF-8) was synthesized via a one-step method involving the linkage and in situ growth of graphitic phase carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) on iron trioxide (Fe<sub>2</sub>O<sub>3</sub>). Subsequently, the material was amine-functionalised, yielding the PEI-Fe-C-ZIF-8 adsorbent, which exhibited dual endo-external recognition capability. The adsorbent exhibited a high CO<sub>2</sub> adsorption capacity, which can rapidly adsorb CO<sub>2</sub> at room temperature and low pressure. The ideal adsorbed solution theory (IAST) selectivity for CO<sub>2</sub>/N<sub>2</sub> (15/85) reached 963.76 at 298 K, 0–100 kPa. Molecular simulations revealed that the material trades partial specific surface area for an increased number of adsorption sites. The synergistic effect of multiple sites facilitated the separation of CO<sub>2</sub>/N<sub>2</sub> by the material.</p>

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Study of novel ZIF materials with dual recognition of internal and external CO2 and efficient CO2/N2 separation

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • Si-wen Yang,
  • Yi-min Dai,
  • Jun-long Wang,
  • Yu-song Yang,
  • Yue-Fei Zhang,
  • Yan Li,
  • Jin-rong Zhong,
  • Li Wan

摘要

To address the growing issue of the greenhouse effect, CO2 capture has emerged as a key area of research. In this paper, zeolite imidazolium salt framework-8 (ZIF-8) was synthesized via a one-step method involving the linkage and in situ growth of graphitic phase carbon nitride (g-C3N4) on iron trioxide (Fe2O3). Subsequently, the material was amine-functionalised, yielding the PEI-Fe-C-ZIF-8 adsorbent, which exhibited dual endo-external recognition capability. The adsorbent exhibited a high CO2 adsorption capacity, which can rapidly adsorb CO2 at room temperature and low pressure. The ideal adsorbed solution theory (IAST) selectivity for CO2/N2 (15/85) reached 963.76 at 298 K, 0–100 kPa. Molecular simulations revealed that the material trades partial specific surface area for an increased number of adsorption sites. The synergistic effect of multiple sites facilitated the separation of CO2/N2 by the material.