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Preparation of modified ZIF90-Pebax mixed matrix membrane and its CO2 separation performance

Authors： Li Dongsheng, Ding Rui, Na Tiancheng, Ruan Xuehua, Jiang Xiaobin, He Gaohong, Xiao Wu *

Units： State Key Laboratory of Fine Chemicals, R&D Center of Membrane Science and Technology, Dalian University of Technology, Dalian 116024, Liaoning, China

KeyWords： ZIF-90; CO2/N2 separation; interface effect; mixed matrix membrane

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2021,41(4):15-24

Abstract：

In order to solve some general problems of the MOFs-based mixed matrix membrane, such as the breathing effect of the fillers, the interface effect between the polymer and the dopant, etc., this work used ZIF-90 which have extremely stable framework structure as the doping material, and then the fillers were modified by amines with different chain length structures by the means of post-synthetic modification (PSM). The influence of different chain length structures and their dosage on ZIF-90 and the gas separation performance of its Pebax-based mixed matrix membrane was explored. We found that the modification of amine alkanes not only does not change the crystal structure of ZIF-90, but can also forms a "fluff"-like structure on the surface of ZIF-90, which can form an organic-organic highly compatible interface. In addition, although the "fluff" structure will reduce the specific surface area and pore volume of the filler itself, it will cross-entangle the polymer chain to form a hardened layer with a large amount of free volume when the length and quantity are appropriate. Differ from amino-modified MOFs, the free volume in the hardened layer can also significantly improve the separation performance of the mixed matrix membrane. Compared with pure ZIF-90/Pebax, the PZ90/Pebax series mixed matrix membranes modified with n-propylamine have improved CO2/N2 selectivity and CO2 permeability. The best separation performance was obtained at 20% modification degree, its CO2/N2 selectivity is 70, and the CO2 permeability reached 140 Barrer, which was increased by 45.8% and 79.4% respectively compared with pure Pebax, and very close to the Robeson upper limit in 2008.

Funds：

国家自然科学基金创新研究群体项目（22021005）；国家重点研发计划项目（2019YFE0119200）。

AuthorIntro：

李东升（1996-），男，山东青岛人，硕士研究生，从事气体分离膜的研究，E-mail：845669309@qq.com

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