| 초록 |
Metal-organic frameworks (MOFs) have been extensively investigated as a promising nanofiller to develop high-performance mixed-matrix membranes (MMMs) for efficient CO2 separation. Although recent studies have indicated the presence of defects is not an exception for MOFs as any other materials, it is still unclear whether defective MOFs would be favorable for its separation performance. Herein, we prepared porosity-controlled UiO-66 to unveil the role of defective MOFs in MMMs. Crosslinked poly(ethylene glycol) diacrylate (PEGDA) was used as a base polymeric matrix with a good compatibility with UiO-66. The best CO2/N2 performance (PCO2 = 470 barrer (4 times higher than pristine PEGDA), αCO2/N2 = 41), which is almost close to the 2008 Robeson upper bound, could be achieved with the most defective UiO-66. Our results directly prove that MOFs inside the polymeric matrix could act as an additional transport channel and its effect could be controlled by tuning the defect concentration. |
