Synthesis of dual-functionalized mixed matrix membrane with amino-GO-Bent/PVDF for efficient separation of CO2/CH4 and CO2/N2

Mixed matrix membranes (MMMs), which combine the characteristics of inorganic nanofillers and organic matrices, have received wide attention because of their good permeability and selective performance for separating CO2 from industrial waste gases. In this work, the amino-GO-loaded bentonite (amino GO-Bent) was prepared by loading -NH2 on the GO surface with a large number of functional sites. Firstly, by introducing -NH2 on the surface of GO and then interacting with bentonite (Bent) organically modified by silane coupling agents through amide bonding. Mixed matrix membranes (MMMs) with an area of 623.7 cm(2) and homogeneous texture were prepared using amino-GO-Bent as inorganic filler to improve the membrane selectivity for CO2/N-2 and CO2/CH4 separation. The results show that the introduction of amino GO-Bent in MMMs can greatly improve the CO2 permeability and obtain high CO2 permeation performance: 2.67945 x 10(-7) cm(3) (STP).cm/s/cm(2)/cmHg, and the selectivity of CO2/N-2 and CO2/CH4 can reach 307.28 and 325.97, respectively. The two selective values were 14 and 18 times higher than those of pure PVDF membranes, and the performance of MMMs far exceeded the Robeson upper limit in 2008, respectively.