▎ 摘　　要

NOVELTY - Method of preparing carboxylated graphene involves: (i) mixing 0.5-2 pts. wt. graphene powder and 7-10 pts. wt. ferrous oxalate uniformly, placing the mixture in ball milling device, and ball milling; (ii) adding 40-50 pts. wt. oxidant to the ball milling device, ball milling, adding deionized water, and ball milling continuously; (iii) sieving and filtering the liquid in the ball milling device, retaining the filter cake, washing with 3% hydrochloric acid, and then washing with 0.5% disodium EDTA; and (iv) washing again with 3% hydrochloric acid, washing with deionized water until the colorless transparent filtrate is washed out, and retaining the solid above the filter paper. USE - Method of preparing carboxylated graphene. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for carboxylated graphene, which has carboxyl content of 10-15 wt.%. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart explaining the method for preparing carboxylated graphene. (Drawing includes non-English language text).