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Preparation and CO2 separation performance of pore engineered MOF-808 based mixed matrix membranes

Authors： ZHANG Mengmeng, GUO Xiangyu, HUANG Hongliang, ZHONG Chongli

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

KeyWords： metal-organic frameworks; mixed matrix membranes; CO2 separation; post-synthetic modification

ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2021,41(3):1-8

Abstract：

The formic acid molecules coordinated to Zr-O clusters in MOF-808 can be easily substituted through post-synthetic modification, providing an efficient way for the engineering of its pore environment. Here, L-histidine (His), a carboxylic acid molecule with rich nitrogen-containing groups, was selected to modify the MOF-808 nanoparticles synthesized through microwave method in this work. CO2 adsorption isotherms indicate that introducing His with nitrogen-containing functional groups into the pore channels of MOF-808 can improve its CO2 affinity and CO2/CH4 separation. Furthermore, a new type of mixed matrix membranes (MMMs) was prepared through the combination of MOF-808-His and 6FDA-DAM. The effect of pore modification on CO2 separation performance of MOF-808/6FDA-DAM MMMs was systematically analyzed by gas separation performance tests and membrane microstructure characterization. The results show that the introduction of His in MOF-808 can significantly improve its selective adsorption capacity towards CO2, and thus improve the CO2/CH4 separation performance of the MMMs. When 10 wt% MOF-808-His nanoparticles were incorporated, the CO2 permeability of the membrane was 764 Barrer, and the CO2/CH4 separation factor was 32.4, which was 104% and 35% respectively higher than that of the pure 6FDA-DAM membrane, exceeding the Robeson upper bound for CO2/CH4 separation.

Funds：

国家自然科学基金项目(21878229, 22008179)；天津市科技计划项目(19PTSYJC00020)

AuthorIntro：

第一作者：张萌萌（1994—），女，河北邢台人，硕士研究生，主要研究方向为MOF基复合膜的制备

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