Method used for preparing mesoporous carbon taking chitosan oligosaccharide as carbon nitrogen source

The invention discloses a method used for preparing mesoporous carbon taking chitosan oligosaccharide as a carbon nitrogen source. The method comprises following steps: 1, F127 is prepared, and is added into water, stirring oil bath treatment is carried out for 0.5 to 1.5h at 40 to 80 DEG C so as to obtain a solution A; 2, chitosan oligosaccharide is added into water, and stirring oil bath treatment is carried out for 0.5 to 1.5h at 40 to 80 DEG C so as to obtain a solution B, wherein, in the stirring process, glyoxal is added; 3, the solution B is added into the solution A so as to obtain a solution C, the solution C is subjected to stirring oil bath treatment for 1.5 to 2.5h at 40 to 80 DEG C so as to obtain a solution D; 4, 1 to 2 times of water is added into the solution D for dilution, an obtained diluted solution is subjected to stirring reaction for 4 to 20h at 40 to 80 DEG C so as to obtain a solution E; 5, the solution E is cooled to room temperature, is introduced into a hydro-thermal reaction vesse