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UiO-66/PI Mixed Matrix Membrane for Gas Separation

Authors： Jiajia Xue1, Ruisong Xu1, Lin Li1, Mengjie Hou1, Yunhua Lu2, Tonghua Wang1

Units： 1State Key Laboratory of Fine Chemicals, Research Institute of Carbon Membranes and Porous Carbon Materials, School of Chemical Engineering, Dalian University of Technology, Dalian 116024; 2School of Chemical Engineering, Liaoning University of Science and Technology, Anshan, 114051, People’s Republic of China

KeyWords： UiO-66; Polyimide; Mixed matrix membrane; Gas separation

ClassificationCode：TQ031.2

year,volume(issue):pagination： 2020,40(6):71-78

Abstract：

UiO-66/PI mixed matrix membranes (MMMs) were prepared by in-situ polymerization using UiO-66 with high thermal stability as filler and PI with high free volume as polymeric matrix, which were further heated to obtain the high-performance thermally rearranged MMMs. The chemical structure, micro-morphology and interchain distance of the MMMs were investigated via
TG, FT-IR, SEM and XRD. Results showed that the UiO-66 nanoparticles were dispersed uniformly into the polymeric matrix by the in-situ doping method. After thermal treatment, the crystal structure of UiO-66 was still maintained and the interchain distance was further enlarged. The gas permeabilities and selectivities for CO2/CH4 and CO2/N2 of the MMMs were both improved due to the incorporation of UiO-66. Compared with the membrane without incorporating UiO-66, the CO2
permeability of the thermally rearranged MMMs with 3 wt% loading could be as high as 3316 Barrer, which was 1.74 times higher. Meanwhile, the selectivities of CO2/N2 and CO2/CH4 were increased from 24.4 and 27.5 to 35.7 and 33.2 respectively. In addition, the gas permeabilities of the membranes were further enhanced when the thermal treatment time was extended. When the thermal time was 5 h, the CO2 gas permeability was 11950 Barrer and the corresponding CO2/CH4 selectivity was 19. The separation performance for CO2/CH4 and CO2/N2 of the UiO-66/PI thermally rearranged MMMs prepared in this work was beyond the upper bound of 2008 Robeson, showing that these membranes exhibited a potential application prospect for CO2 separation and capture.

Funds：

国家自然科学基金面上项目“借助于聚合物聚集态结构的调控制备高性能气体分离炭膜”（21878033），国家自然科学基金重点基金“用于脱碳提纯氢气的CO2优先渗透分离膜研究”（21436009）

AuthorIntro：

薛佳佳（1994），女，河南，硕士研究生，硕士，工学学位，纳米材料与膜材料，E-mail：zhazha@mail.dlut.edu.cn

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