Energy Efficient Synthesis of Ordered Mesoporous Carbon Nitrides with a High Nitrogen Content and Enhanced CO 2 Capture Capacity

Highly ordered mesoporous carbon nitrides (MCN) with 3D structure and a high nitrogen content are successfully prepared for the first time using “uncalcined” mesoporous silica template, KIT‐6 and 3‐amino‐1,2,4‐triazole as a single molecular carbon and nitrogen precursor. The prepared MCN with C and N stoichiometry of C 3 N 5 shows unique CN framework and exhibits the CO 2 capture capacity of 5.63 mmol g −1 at 273 K and 30 bar, which is higher than that of MCN with 2D structure and C 3 N 4 stoichiometry.