胺化木质素磺酸钠插层水滑石/Pebax混合基质膜的制备及气体分离性能研究

Preparation and gas separation performance of aminated sodium lignosulfonate intercalated hydrotalcite/Pebax mixed matrix membrane

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CO_(2)/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CO_(2)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CO_(2)/N_(2)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 CO_(2)/N 2 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 CO_(2) 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 CO_(2)/N_(2) separation and selectivity of mixed matrix membranes.