▎ 摘　　要

NOVELTY - Modified three-dimensional graphene hydrogel is claimed. In hydrogel, the content ratio of oxygen element and carbon element is 0.2-0.3, the specific surface area is not less than 180 m2/g, total pore volume is 0.08 0.12 cm3/g, and pore volume is 0.04-0.06 cm3/g. USE - Used as modified three-dimensional graphene hydrogel. ADVANTAGE - The graphene hydrogel has increased specific surface area, improves adsorption rate and absorbance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing modified three-dimensional graphene hydrogel comprising reacting aqueous solution of weak alkaline with graphene oxide powder at a certain temperature to obtain oxidized three-dimensional graphene hydrogel, then immersing oxidized three-dimensional graphene hydrogel in strong oxidizing inorganic acid, reacting at 40-100 degrees C for 1-12 hours, taking out the hydrogel and water washing until becomes neutral to obtain final product.