▎ 摘　　要

NOVELTY - Preparation of graphene oxide hydrogel involves adding vitamin C to a graphene oxide dispersion, such that the ratio of graphene oxide with respect to vitamin C reaches 1:50-1:300, and incubating the dispersion at a temperature of more than 45 degrees C for a time required for self-assembling the porous hydrogel from the dispersion. USE - Preparation of graphene oxide hydrogel used for preparing hybrid hydrogel for forming filter for removing contaminants e.g. organic contaminants, heavy metal contaminants, and microorganisms from fluid (all claimed) e.g. water and air. Uses include but are not limited to business, institutional, and public buildings, and mining, metallurgy, textile, chemical processing, pharmaceutical, electronic, and automobile industries. ADVANTAGE - The method enables preparation of graphene oxide hydrogel with excellent stability and mechanical properties, high adsorption efficiency with respect to contaminants, and reduced energy consumption, by simple, economical, and environmentally-friendly, process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of hybrid hydrogel, which involves adding cellulose nanoparticles to graphene oxide suspension, such that the ratio of graphene oxide with respect to cellulose nanoparticles reaches 4:1-1:1, adding vitamin C to the suspension, and incubating.