(185l) Two-Dimensional Porous Carbon Nanoplates Mixed Matrix Membranes for CO2 Capture

Two-dimensional (2D) porous carbon Nanoplates (PCNs) were synergistically integrated to poly (ether-b-amide) (PEBAX) to develop a highly selective mixed-matrix membranes (MMMs) for CO2 separation. In this work, we have developed a method for the synthesis of 2D PCNs with extremely uniform, accessible ultramicropores, and controllable thickness. Therefore, the high-aspect ratio of the PCNs in a polymer matrix increase the length of the tortuous path of gas diffusion and generate a rigidified interface between the polymer matrix and fillers, enhancing the permeability and the diffusivity selectivity. The ultramicropores of the PCNs has high sorption capacity for CO2 to enhance the solubility selectivity. Moreover, PCNs/Pebax MMMs showed improved molecular sieving properties, due to a stiffer interphase between the filler and the polymer and a reduction in the effective aperture size of the PCNs. As a result, MMM doped with 0.5 wt. % PCNs-loading exhibits the best CO2 separation performance, which shows the CO2/N2 selectivity up to 85 combined with CO2 permeability of 132 Barrer. Surpassing the Robeson Upper Bound of 2008. Having distinct improvement of CO2 separation performance, the PCNs/PEBAX MMMs indicates promising applications in CO2 capture processes.