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<p>Due to its benefits of low energy consumption, minimal environmental pollution, and simple operation, membrane technology is considered a carbon capture technology with extensive application possibilities. In this study, the ultraviolet cross-linking method is used to inhibit crystallization of polymers with a molecular weight of less than 1500 and enable polyethylene oxide (PEO) to form a rubbery polymer matrix. This approach avoids membrane separation defects and low CO<sub>2</sub> solubility caused by high crystallinity. The hydroxyl-rich surface of layered double hydroxide (LDH) is used to provide the CO<sub>2</sub>-philic site in the form of “docking station-like” by introducing amino groups with a strong affinity for CO<sub>2</sub>, and forming a dual facilitated transport channel through the nanosheet interlayer channel and the presence of bound water to strengthen the reaction mechanism of the membrane. Based on the coupling of solubility-diffusion and facilitated transport mechanisms, the optimal separation performance is achieved when the NH<sub>2</sub>-PDA-LDH doping is 0.4 wt%, with a CO<sub>2</sub> permeability of 572.4 Barrer and a selectivity of up to 60.5. The interlayer fast transport channels result in a maximum permeability of 3982 Barrer in the wet state.</p> Graphical Abstract <p></p>

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Amino-functionalized two-dimensional lamellar double metal hydroxide-based MMMs with interlayer CO2-philic transport channels for efficient CO2 capture

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Ningning Gao,
  • Yucheng Pan,
  • Wei Huang,
  • Qingping Xin,
  • Min Zhang,
  • Jiaxin Wu,
  • Dengdi Wu,
  • Mengke Wang,
  • Xiaoli Ding,
  • Ligang Lin,
  • Yuzhong Zhang

摘要

Due to its benefits of low energy consumption, minimal environmental pollution, and simple operation, membrane technology is considered a carbon capture technology with extensive application possibilities. In this study, the ultraviolet cross-linking method is used to inhibit crystallization of polymers with a molecular weight of less than 1500 and enable polyethylene oxide (PEO) to form a rubbery polymer matrix. This approach avoids membrane separation defects and low CO2 solubility caused by high crystallinity. The hydroxyl-rich surface of layered double hydroxide (LDH) is used to provide the CO2-philic site in the form of “docking station-like” by introducing amino groups with a strong affinity for CO2, and forming a dual facilitated transport channel through the nanosheet interlayer channel and the presence of bound water to strengthen the reaction mechanism of the membrane. Based on the coupling of solubility-diffusion and facilitated transport mechanisms, the optimal separation performance is achieved when the NH2-PDA-LDH doping is 0.4 wt%, with a CO2 permeability of 572.4 Barrer and a selectivity of up to 60.5. The interlayer fast transport channels result in a maximum permeability of 3982 Barrer in the wet state.

Graphical Abstract