Carbazole-Based Porous Organic Polymers with Ag(I) Doping and Derived Porous Carbon for Enhanced Adsorption of Polycyclic Aromatic Hydrocarbons

The polycyclic aromatic hydrocarbons (PAHs) are important chemical raw materials and are abundant in fluid catalytic cracking (FCC) diesel. Adsorption is an effective method to extract PAHs from FCC diesel. Here, carbazole-based porous organic polymers were synthesized as fundamental adsorbents which contained a highly conjugated system and heteroatom (N). Ag(I) doping and direct carbonization were used to enhance the PAHs' adsorption capacity. The carbonized P1-C-1000 possessed a high BET surface area (1101 m2 g–1) and exhibited excellent PAH adsorption capacity (41.73 mg/g, naphthalene; 104.18 mg/g, anthracene), which was due to the high porosity, π–π conjugated interaction, and p−π conjugated interaction between N atoms and PAHs. The introduction of cation−π, π–π, and p−π interactions in porous materials provides a highly efficient approach in the removal of aromatics.