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A Superacid-Catalyzed Synthesis of Porous Membranes Based on Triazine Frameworks for CO 2 Separation

2012; American Chemical Society; Volume: 134; Issue: 25 Linguagem: Inglês

10.1021/ja304879c

1943-2984

Xiang Zhu, Chengcheng Tian, Shannon M. Mahurin, Song‐Hai Chai, Congmin Wang, Suree Brown, Gabriel M. Veith, Huimin Luo, Honglai Liu, Sheng Dai,

Membrane Separation and Gas Transport

A general strategy for the synthesis of porous, fluorescent, triazine-framework-based membranes with intrinsic porosity through an aromatic nitrile trimerization reaction is presented. The essence of this strategy lies in the use of a superacid to catalyze the cross-linking reaction efficiently at a low temperature, allowing porous polymer membrane architectures to be facilely derived. With functionalized triazine units, the membrane exhibits an increased selectivity for membrane separation of CO(2) over N(2). The good ideal CO(2)/N(2) selectivity of 29 ± 2 was achieved with a CO(2) permeability of 518 ± 25 barrer. Through this general synthesis protocol, a new class of porous polymer membranes with tunable functionalities and porosities can be derived, significantly expanding the currently limited library of polymers with intrinsic microporosity for synthesizing functional membranes in separation, catalysis, and energy storage/conversion.