将胺化木质素磺酸钠(AL)通过阴离子交换法插层锌铝水滑石(LDH),得到填料AL-LDH,以聚醚嵌段酰胺共聚物(Pebax1657)为分离膜基材,制备具有一定成本优势的高CO2/N2选择性混合基质膜。通过傅里叶红外变换光谱仪、X射线衍射仪进行定性和结构表征。采用SEM观察AL-LDH和LDH的微观结构。力学性能测试结果表明,3% AL-LDH/Pebax的断裂伸长率和拉伸强度分别达到464.7%和18.7MPa,比纯Pebax膜分别提升了66.4%和12.6%。AL-LDH/Pebax的CO2渗透率最高可达113.60Barrer,比纯膜提高了131%,比LDH/Pebax系列提升了15%,证明AL-LDH能进一步提升混合基质膜的CO2/N2分离和选择性。
In this study,aminated sodium lignosulfonate (AL) was intercalated into zinc aluminum hydrotalcite (LDH) by anion exchange method to obtain filler AL-LDH,and the polyether block amide copolymer (Pebax1657) was chosen as the substrate to prepare cost-effective mixed matrix membranes (MMMs) with high CO2/N2 selectivity.They were qualitatively and structurally characterized by Fourier transform infrared spectroscopy (FT-IR),X-ray diffractometer (XRD).SEM was used to observe the microstructure of AL-LDH and LDH.The mechanical property test results of MMMs showed that the elongation at break and tensile strength of 3% AL-LDH/Pebax reached 464.7% and 18.7MPa,respectively,which were 66.4% and 12.6% higher than those of pure Pebax membranes.The CO2 permeability of AL-LDH/Pebax reached a maximum of 113.60 Barrer,which was 131% higher than that of pure membranes,and 15% higher than that of LDH/Pebax series,which proved that AL-LDH could further improve the CO2/N2 separation and selectivity of mixed matrix membranes.
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基金资助
江苏省产学研合作项目(BY2021130)
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