Modulated UiO-66-Based Mixed-Matrix Membranes for CO2 Separation

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• 作者：M. Waqas Anjum ; Frederik Vermoortele ; Asim Laeeq Khan ; Bart Bueken ; Dirk E. De Vos ; Ivo F. J. Vankelecom
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25193-25201
• 全文大小：528K
• ISSN：1944-8252

文摘

Mixed-matrix membranes (MMMs) composed of polyimide (PI) and metal鈥搊rganic frameworks (MOFs) were synthesized using Matrimid as the polymer and zirconium terephthalate UiO-66 as the filler. The modulation approach, combined with the use of amine-functionalized linkers, was used for synthesis of the MOF fillers in order to enhance the intrinsic separation performance of the MOF and improve the particle鈥揚I compatibility. The presence of amine groups on the MOF outer surface introduced either through the linker, through the modulator, or through both led to covalent linking between the fillers and Matrimid, which resulted in very stable membranes. In addition, the presence of amine groups inside the pores of the MOFs and the presence of linker vacancies inside the MOFs positively influenced CO₂ transport. MMMs with 30 wt % loading showed excellent separation performance for CO₂/CH₄ mixtures. A significant increase in the mixed-gas selectivity (47.7) and permeability (19.4 barrer) compared to the unfilled Matrimid membrane (i.e., 50% more selective and 540% more permeable) was thus achieved for the MMM containing the MOF prepared from 2-aminoterephthalic acid and 4-aminobenzoic acid, respectively used as the linker and as the modulator.