Efficient Greenhouse Gas Sulfur Hexafluoride Capture in Ultramicroporous Triazine-Rich Polymers with High Porosity

Driven by reducing the environmental impact of sulfur hexafluoride, robust triazine-rich ultramicroporous polymer networks (UTP-m1 and UTP-p1) with high porosity were prepared through a facile “one-step” polycondensation utilizing six active amino groups of 4,4′,4″-tris(2,4-diaminotriazinyl)triphenylamine (TDATPA) as a triangle-liked core monomer and isophthalaldehyde or terephthalaldehyde as a chain monomer without adding any catalysts in the medium of dimethyl sulfoxide. Together with an excellent BET special surface area (1518 m2 g–1) and total volume (1.6 cm3 g–1), the synergistic role of high nitrogen contents, the narrow pore size distribution, and amounts of ultramicroporous molecule sieving in the polymer networks brought about a high adsorption SF6/N2 selectivity of 63.4. The relationships between the geometry configuration of the target monomers, special surface areas, pore volume, and pore size as well as their impact on the adsorption and separation property of SF6/N2 were investigated in detail with respect to adsorption capacities and polarities of SF6 and N2 gases. Combined with the excellent physicothermal stabilities, the ultramicroporous polymers obtained in this study exhibited potential applications for SF6 capture sequestration.