Enhanced gas separation performance of mixed matrix membranes from graphitic carbon nitride nanosheets and polymers of intrinsic microporosity
Enhanced gas separation performance of mixed matrix membranes from graphitic carbon nitride nanosheets and polymers of intrinsic microporosity
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DOI：
10.1016/j.memsci.2016.04.019
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发表时间：
2016-09
影响因子：
9.5
通讯作者：
Zhizhang Tian;Shaofei Wang;Yutong Wang;Xiaorui Ma;K. Cao;Dongdong Peng;Xingyu Wu;Hong Wu;Zhongyi Jiang
中科院分区：
文献类型：
--
作者：
Zhizhang Tian;Shaofei Wang;Yutong Wang;Xiaorui Ma;K. Cao;Dongdong Peng;Xingyu Wu;Hong Wu;Zhongyi Jiang
在本研究中，通过将 g-C3N4 纳米片掺入固有微孔聚合物（PIM-1）基质中，制备了新型混合基质膜（MMM）。使用场发射扫描电子显微镜（FESEM）、热重分析（TGA）、差示扫描量热法（DSC）、X射线衍射仪（XRD）和电子拉伸机对PIM-1/g-C3N4MMM进行表征。 MMM 的纯气体渗透测试针对以下气体种类进行：CO2、CH4、N2 和 H2。通过掺入 g-C3N4 纳米片，可以合理地调节 MMM 的气体渗透性能。首先，具有高表面积比的二维结构g-C3N4可以有效地影响PIM-1聚合物链的堆积，并在PIM-1基质和g-C3N4填料之间的界面处创建额外的传输路径，从而导致渗透系数增加，特别是在低g-C3N4负载下。其次，与纯PIM-1膜相比，g-C3N4的周期性超微孔具有尺寸筛分作用，可以优先促进较小分子（H2）的传输，并且在不影响气体渗透性的情况下提高了对H2/CH4和H2/N2的选择性。同时，掺入g-C3N4的PIM-1/g-C3N4MMM也表现出更好的长期性能。有序的二维结构、优异的界面相容性和易于大规模生产使得g-C3N4在制造气体分离MMM方面具有广阔的潜力。
In this study, novel kinds of mixed matrix membranes (MMMs) were prepared by incorporating g-C3N4nanosheets into the matrix of polymers of intrinsic microporosity (PIM-1). The PIM-1/g-C3N4MMMs were characterized using field emission scanning electron microscope (FESEM), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction meter (XRD) and an electronic stretching machine. Pure gas permeation tests of the MMMs were conducted for the following gas species: CO2, CH4, N2and H2. Gas permeation properties of the MMMs were rationally tuned with the incorporation of g-C3N4nanosheets. Firstly, the 2D structural g-C3N4with high surface area ratio can efficiently affect the packing of PIM-1 polymer chains and create additional transport pathways at the interface between PIM-1 matrix and g-C3N4filler, which result in an increment of permeability coefficients, especially at low g-C3N4loadings. Secondly, the periodic ultramicropores of g-C3N4with size-sieving effect can preferentially facilitate the transport of smaller molecules (H2) and the selectivities for H2/CH4and H2/N2were increased without compromise in gas permeability, compared with pure PIM-1 membrane. Meanwhile, the PIM-1/g-C3N4MMMs also demonstrated better long-term performance with the incorporation of g-C3N4. The ordered 2D-structure, superior interfacial compatibility and easy mass-production endow g-C3N4with promising potential in fabricating gas separation MMMs.