Sandwich-type membranes comprising of graphene oxide (GO) as a “bun” and sodalite (SOD) nanocrystals with different morphologies and sizes as an inner layer were prepared. First, the SOD nanocrystals with spheroidal (size of 30 nm) and flake-like (size of 150 nm) morphologies were synthesized from precursor suspensions containing the same amount of GO as a modifier but different amounts of water. Second, the SOD nanocrystals with different morphologies and sizes were deposited between two GO layers to form the sandwich-type membrane. The performance of the sandwich-type membranes in H₂/CO₂ gas separation was optimized by tuning the properties of the SOD inner layer. The membrane containing spheroidal SOD nanocrystals showed higher H₂ permeance of 4003±1965 GPU and H₂/CO₂ selectivity of 45.5±1.7 at 25 ºC in comparison to the pristine GO membrane (1642±145 GPU and H₂/CO₂ selectivity of 11.2±2.1).

制备了由氧化石墨烯（GO）作为“小圆桶”和方钠石（SOD）纳米晶体作为内层的三明治型膜。首先，从前驱体悬浮液合成了球形（尺寸为30 nm）和片状（尺寸为150 nm）形貌的SOD纳米晶体，该悬浮液包含相同量的GO作为改性剂，但水量不同。其次，将具有不同形态和尺寸的SOD纳米晶体沉积在两个GO层之间，以形成夹心型膜。通过调节SOD内层的性能，可以优化H ₂ / CO ₂气体分离过程中三明治型膜的性能。含有球形SOD纳米晶体的膜显示出更高的H ₂与原始GO膜（1642±145 GPU和H ₂ / CO ₂选择性为11.2±2.1）相比，在25ºC时4003±1965 GPU的磁导率和H ₂ / CO ₂选择性为45.5±1.7 。