Solvent-free mechanochemical synthesis of a carbazole-based porous organic polymer with high CO2 capture and separation

The rapid accumulation of CO2, as the main component of greenhouse gas, causes the global warming and significant climatic variation along with a series of environmental problems. At the moment, the adsorption and capture of CO2 is identified as one of the most promising and effective methods to control and reduce CO2. Hence, it is in urgent need of constructing highly efficient porous materials with excellent stability to capture CO2. A porous organic polymer (denoted as sf-PTPTCz) is firstly designed and synthesized by the FeCl3-trigged oxidative coupling polymerization of tetrakis (4-(9H-carbazol-9-yl)phenyl)methane (TPTCz) via the solvent-free mechanochemical approach, which is an environmentally friendly preparation method and industrialized mass preparation. The as-synthesized porous material is further investigated by C-13 solid-state NMR, Fourier transform infrared, powder X-ray diffraction, transmission electron microscope, scanning electron microscope, and gas sorption. By virtue of high surface area and excellent stability, the as-synthesized porous sample exhibits a high CO2 adsorption ability and an excellent selectivity of CO2 over N-2.