Nitrogen-oxygen defects polytriazineimide photocatalytic efficient and selective oxidation of benzyl alcohol

By a one-step molten salt calcination method, the copolymer 4,6-diaminopyrimidine was successfully incorporated into the precursor melamine to prepare a polytriazineimide photocatalyst rich in nitrogen and oxygen defects for the selective oxidation of benzyl alcohol. A series of characterizations confirmed the existence of the defects, and the photoelectric performance test showed that the defects could enhance the responsiveness of the catalyst to light and facilitate the separation of photogenerated carriers. Moreover, the existence of nitrogen and oxygen defects helps to adsorb more surface oxygen molecules to generate more superoxide radicals as the main active species to selectively oxidize benzyl alcohol. Therefore, the 46DP-10 % sample exhibits excellent benzyl alcohol oxidation performance, the conversion rate is 84.9 % under visible light oxygen atmosphere, and the selectivity is greater than 99 %. This work presents a novel idea for creating nitrogen and oxygen deficient materials through molten salt-assisted calcination of precursors and copolymers.