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首页> 外文期刊>Journal of Applied Polymer Science >Pebax-based mixed matrix membranes loaded with graphene oxide/core shell ZIF-8@ZIF-67 nanocomposites improved CO2 permeability and selectivity
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Pebax-based mixed matrix membranes loaded with graphene oxide/core shell ZIF-8@ZIF-67 nanocomposites improved CO2 permeability and selectivity

机译：基于PeBax的混合基质膜，装载石墨烯氧化物/芯壳ZIF-8 ZIF-67纳米复合材料改善了CO2渗透性和选择性

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In order to facilitate CO2 transport in Pebax-based membranes, graphene oxide (GO)/core shell ZIF-8@ZIF-67 nanocomposites were loaded in Pebax copolymer to improve CO2 permeability and selectivity. The 0.5 wt% GO doped core shell ZIF-8@ZIF-67, which gave highest CO2 adsorption capacity of 1.12 mmol/g, was used as nanocomposite. The incorporated GO/core shell ZIF enhanced CO2 adsorption via unsaturated metal sites (Zn-O or Co-O), because O atoms in GO substituted for N atoms coordinated with Zn and Co single atoms in core shell ZIF-8@ZIF-67. Positron annihilation lifetime spectroscopy indicated that GO-templated core shell ZIF nanocomposites generated extra free volume and provided low-resistance channels to facilitate CO2 transport. Fourier transform infrared spectroscopy analysis revealed that hydrogen bonds were generated between Pebax polymer chains and GO-templated core shell ZIF which improved swelling resistance and reduced interface defects. Therefore, Pebax-based MMMs loaded with 5 wt% GO/core shell ZIF-8@ZIF-67 exhibited optimum CO2 permeability (173.2 barrers) and ideal selectivity of CO2/N-2 (61.9) and CO2/H-2 (11.6), which were 99.7%, 66.4%, and 20.8% higher than Pebax membranes and surpass Robeson 2008 upper bound. The tensile strength increased by 17.6% to 28.8 MPa and elongation at break increased by 7.61%-554.6% when pure Pebax membranes were incorporated with 2.5 wt% GO/core shell ZIF-8@ZIF-67.
机译：为了促进Pebax基膜中的CO2传输，氧化石墨烯（GO）/核壳ZIF-8@ZIF-将67种纳米复合材料装入Pebax共聚物中，以提高CO2的渗透性和选择性。0.5wt%GO掺杂的核壳ZIF-8@ZIF-67作为纳米复合材料，其最高CO2吸附容量为1.12 mmol/g。由于GO中的O原子取代了核壳ZIF中与Zn和Co单原子配位的N原子，因此合并的GO/核壳ZIF通过不饱和金属位点（Zn-O或Co-O）增强了CO2吸附-8@ZIF-67.正电子湮没寿命谱表明，GO模板核壳ZIF纳米复合材料产生了额外的自由体积，并提供了低电阻通道，以促进CO2传输。傅立叶变换红外光谱分析表明，Pebax聚合物链和GO模板核壳ZIF之间生成氢键，提高了抗溶胀性，减少了界面缺陷。因此，基于Pebax的MMM中含有5 wt%的GO/核壳ZIF-8@ZIF-67表现出最佳的CO2渗透性（173.2巴）和理想的CO2/N-2（61.9）和CO2/H-2（11.6）选择性，分别比Pebax膜高99.7%、66.4%和20.8%，超过了Robeson 2008的上限。当纯Pebax膜与2.5 wt%GO/核壳ZIF复合时，拉伸强度提高17.6%至28.8MPa，断裂伸长率提高7.61%-554.6%-8@ZIF-67.

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