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Mechanochemical synthesis of mixed ligands MOF filler for highly efficient CO2 separation

Authors： ZHAO Xin，QIAO Zhihua，SUN Yuxiu，GUO Xiangyu ，ZHONG Chongli

Units： State Key Laboratory of Separation Membranes and Membrane Processes，School of Chemical Engineering and technology，Tiangong University，Tianjin 300387，China

KeyWords： Mechanochemical method; ZIF-8-Bim-Ica; Mixed ligands; Mixed matrix membranes; CO2 separation

ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2021,41(5):11-16

Abstract：

ZIF-8 was synthesized by mechanization method. With ZIF-8 as the parent，the mixed ligands MOF material ZIF-8-Bim-Ica was obtained by mechanochemical means to introduce benzimidazole (Bim) and 2-Imidazolecarboxaldehyde (Ica). Mixed matrix membranes (MMMS) was prepared by mixing with polyether copolyamide (Pebax-1657). The chemical structure of ZIF-8-Bim-Ica was determined by XRD，FTIR and 1H NMR spectra，and the cross section of the mixed matrix membranes were characterized by SEM. The results showed that the structure of ZIF-8 was not damaged after the introduction of Bim and Ica, and the ZIF-8-Bim-Ica particles were evenly dispersed in the Pebax polymer. The addition of ZIF-8-Bim-Ica improved the CO2 permeation flux and the CO2/CH4 selectivity of the mixed matrix membranes. Compared with the pure membrane，the CO2 permeation flux of the mixed matrix membrane with 10 wt% doping amount can reach 269.3 Barrer，increased by 29.3 %，and the CO2/CH4 selectivity is increased from 18.5 to 43.8，and the stability of the membrane can be maintained for at least 40 hours. The ZIF-8-Bim-Ica/Pebax mixed matrix membranes prepared by this method has a high selectivity to CO2，showing a good application prospect in the field of CO2 gas separation.

Funds：

天津市科技计划项目(19PTSYJC00020)

AuthorIntro：

赵新（1995-），男，河北衡水人，硕士研究生，主要研究方向为气体分离膜的制备，Email：zhaoxintgd@163.com

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