Room-Temperature Synthesis of Hollow Carbazole-Based Covalent Triazine Polymers with Multiactive Sites for Efficient Iodine Capture-Catalysis Cascade Application

In this work, we report a room-temperature synthesis of multifunctional hollow carbazole-based covalent triazine polymers (H-C-CTPs) via a simple FeCl3-catalyzed oxidative coupling reaction using the diblock copolymer (PLA-b-PNVC) and cyanuric chloride (TCT) monomer as coprecursors. The resulting H-C-CTPs exhibit excellent adsorption capacity for iodine vapor (up to 4.60 g·g–1) or iodine solution (up to 293 mg·g–1), which is higher than those of their nonhollow counterparts and most of the reported adsorbents. More importantly, the iodine-adsorbed H-C-CTPs can be used to efficiently catalyze the CO2 cycloaddition reaction with additional recyclability. The synergistic effect, due to the special hollow porous structures with abundant carboxylic groups and the nitrogen content in H-C-CTPs, is used to interpret the superior iodine capture capacity and subsequent iodine-catalytic CO2 cycloaddition performance. This work therefore opens up an efficient and mild route in the design of advanced hollow porous polymer materials for environmentally friendly catalytic applications.