Aldehyde and carboxyl groups can be introduced into cellulose polymer chains by selective oxidation, which is one of the most important methods to modify and explore cellulose resources. The two main selective oxidation systems of cellulose are NaIO4and NaClO/TEMPO/NaBr. The secondary hydroxyl group of cellulose can be oxidized to aldehyde group selectively by the former oxidation system, and the primary hydroxyl group of cellulose can be oxidized to carboxyl group selectively by the latter. The oxidation r...