Optimized fabrication of mixed matrix membranes based on amino-MIL-101(Cr) for highly efficient CO2 separation

被引：0
作者：
Yang K. [1 ]
Ruan X. [1 ]
Dai Y. [1 ]
Wang J. [1 ]
He G. [1 ]
机构：
[1] State Key Laboratory of Fine Chemicals, Research Center of Membrane Science & Technology, Dalian University of Technology, Dalian, 116024, Liaoning
来源：
Huagong Xuebao/CIESC Journal | 2020年 / 71卷 / 01期
关键词：
Carbon dioxide; Membrane; Metal-organic framework; Permeability; Selectivity; Separation;
D O I：
10.11949/0438-1157.20191283
中图分类号：
学科分类号：
摘要：
Metal-organic framework MIL-101(Cr) is a kind of new membrane materials with large pore size and high porosity, which can greatly enhance CO2 permeability for mixed matrix membranes. However, the blending with MIL-101(Cr) particles will lead to obvious decrease in CO2 selectivity, mainly caused by the following two reasons: terephthalic acid, as organic legend in MIL-101(Cr), is low in CO2 affinity relatively; particles after drying for activation, unable to be adequately dispersed in casting solution, would form defects in membranes. In response, two innovative attempts were carried through in this work. At first, amino-MIL-101(Cr) fillers were synthesized with 2-amino-terephthalic acid as organic legend, which could increase solution selectivity. Secondly, the retrofitted technique with MIL-101(Cr) activation after membrane fabrication was utilized to decrease defects caused by particle aggregation. FI-TR characterization revealed that amino-MIL-101(Cr) particles have been synthesized successfully. SEM images demonstrated that both MIL-101(Cr) and amino-MIL-101(Cr) particles can be evenly distributed in mixed matrix membranes through the retrofitted technique. Afterward, the membranes were fabricated with amino-MIL-101(Cr) blended in ethyl cellulose. Gas permeation tests revealed that the optimum particle loading is around 15%(mass). In this case, P_(CO_2 ) is about 166 barrer (16.5% and 93.0% higher than MIL-101(Cr) blended and pristine membranes, respectively), while α_(CO_2/N_2 ) is about 23.9 (25.3% and 17.1% higher than that of MIL-101(Cr) blended and pristine membranes, respectively). On the whole, the blending with amino-MIL-101(Cr) particles through casting-activation approach can significantly enhance CO2 selective permeation in mixed matrix membranes. © All Right Reserved.
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页码：329 / 336
页数：7
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