Optimized fabrication of mixed matrix membranes based on amino-MIL-101(Cr) for highly efficient CO2 separation
【Abstract】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 the obvious decrease in CO2 selectivity, mainly caused by the following two reasons: terephthalic acid, as organic ligand in MIL-101(Cr), is low in CO2 affinity relatively; the 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 out in this work. At first, amino-MIL-101(Cr) fillers were synthesized with 2-aminoterephthalic acid as organic ligand, which could increase the solution selectivity. Secondly, the retrofitted technique with MIL-101(Cr) activation after membrane fabrication was utilized to decrease the defects caused by particle aggregation. FI-TR characterization reveals that the amino-MIL-101(Cr) particles are synthesized successfully. The SEM images demonstrate 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 reveal that the optimum particle loading is around 15% (mass). In this case, PCO2 is about 166 barrer (16.5% and 93.0% higher than the values of MIL-101 (Cr blended and pristine membranes, respectively), while αCO2/N2 is about 23.9 (25.3% and 17.1% higher than the values of MIL-101(Cr) blended and pristine membranes, respectively). On the whole, the blending with amino-MIL-101(Cr) particles through the casting–activation approach can significantly enhance CO2 selective permeation in mixed matrix membranes.
【Keywords】 carbon dioxide; membrane; separation; metal-organic framework; selectivity; permeability;
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