Imperfect perfection: Selective induction of CO2 during diffusion in mixed matrix membranes

Metal-organic frameworks (MOFs) are one of the optimal choice to be endowed for designing high-performance CO 2 separation membranes as the fillers, ascribing their unprecedented tunability and chemical functionalities. However, while pursuing more types of MOFs, researchers have slightly explored their inherent properties. Thus, we incorporated missing-linker defects into Zirconium Metal−Organic Framework for tailoring the superior CO 2 transport channel through tune their microporosity . And a series of defect-engineered UiO-66 (UiO-AcOH) fillers were synthesized and mingled into PIM-based matrix with large free volume. Resistance model simulations and gas permeation tests confirmed that the defective UiO-66 can greatly improved the competitive adsorption of the dispersed phase in Mixed Matrix Membranes (MMMs), offering more degree of freedom for the transportation of CO 2 . At the optimal ratio, the CO 2 permeability of the UiO-AcOH-1.4/PIM-15 wt% MMMs increased nearly 3.5 times (CO 2 =11261 Barrer, and the CO 2 /N 2 selectivity is 26, almost increasing 23% contrasted pure film. Moreover, MMMs possess excellent long-term working stability and anti-aging properties, showing excellent gas separation performance.