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Introducing hydrophilic ultra-thin ZIF-L into mixed matrix membranes for CO2/CH4 separation

机译：将亲水性超薄ZIF-1引入CO 2 / CH4分离的混合基质膜中

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摘要

Mixed matrix membranes (MMMs) were developed by mixing hydrophilically modified two-dimensional (2D) imidazole framework (named as hZIF-L) flakes into a Pebax MH 1657 (Pebax) matrix, and designed to separate carbon dioxide/methane (CO2/CH4) mixtures. The hZIF-L flakes were important for increasing the effectiveness of the MMMs. First, the tannic acid (TA) etched hZIF-L flakes have a large number of microporous (1.8 nm) and two-dimensional anisotropic transport channels, which offered convenient gas transport channels and improved the permeability of CO2. Second, the TA molecules provide the surface of the ZIF-L flakes with more hydrophilic functional groups such as carbonyl groups (C=O) and hydroxyl groups (-OH), which could effectively prevent non-selective interfacial voids and filler agglomeration in the Pebax matrix, and also presented strong binding ability to water and CO2 molecules. The satisfactory interface compatibility and affinity with the CO2 molecule promoted its permeability, solubility, and selectivity. As a result, the MMMs exhibited the highest performance of gas separation with the hZIF-L flake weight content of 5%, at which the CO2 permeability and CO2/CH4 selectivity were 502.44 barrer and 33.82 at 0.2 MPa and 25 degrees C, respectively.
机译：混合基质膜（MMM中）通过混合亲水改性的二维（2D）咪唑框架（命名为hZIF-L）薄片成的Pebax MH 1657（的Pebax）矩阵开发的，并且被设计成单独的二氧化碳/甲烷（CO2 / CH4 ）的混合物。该hZIF-L片是为增加的MMM的有效性非常重要。首先，单宁酸（TA）蚀刻hZIF-L薄片具有大量微孔（1.8纳米）和二维各向异性传输信道，其提供方便气体传输信道和提高CO2的渗透性。其次，TA分子提供更亲水性官能团的ZIF-L薄片的表面，如羰基（C = O）和羟基（-OH），从而可以有效地防止非选择性界面空隙和填料附聚在PEBAX矩阵，并且还呈现强的结合能力的水和二氧化碳分子。令人满意的界面相容性和亲和性与CO 2分子促进了它的渗透性，溶解性和选择性。其结果是，所述的MMM表现出与hZIF-L薄片重量含量的5％，其中所述CO 2渗透性和CO 2 / CH 4选择性分别为502.44巴拉和33.82在0.2MPa和25℃，气体分离的最高的性能。

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  • 来源
    《RSC Advances》 |2019年第40期|共10页
  • 作者

    Zhu Weifang; Li Xueqin; Sun Yanyong; Guo Ruili; Ding Siyuan;

  • 作者单位

    Shihezi Univ Sch Chem &

    Chem Engn Key Lab Green Proc Chem Engn Xinjiang Bingtuan Shihezi 832003 Xinjiang Peoples R China;

    Shihezi Univ Sch Chem &

    Chem Engn Key Lab Green Proc Chem Engn Xinjiang Bingtuan Shihezi 832003 Xinjiang Peoples R China;

    Shihezi Univ Sch Chem &

    Chem Engn Key Lab Green Proc Chem Engn Xinjiang Bingtuan Shihezi 832003 Xinjiang Peoples R China;

    Shihezi Univ Sch Chem &

    Chem Engn Key Lab Green Proc Chem Engn Xinjiang Bingtuan Shihezi 832003 Xinjiang Peoples R China;

    Shihezi Univ Sch Chem &

    Chem Engn Key Lab Green Proc Chem Engn Xinjiang Bingtuan Shihezi 832003 Xinjiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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