▎ 摘　　要

NOVELTY - Three dimensional (3D) nanostructured reduced graphene oxide comprises self-supporting solid three-dimensional structure, with pore wall thickness up to 100 nm and comprising apparent pores between 10 and 100 nm. USE - Three dimensional (3D) nanostructured reduced graphene oxide used as adsorbent material in industrial, pharmaceutical, medical and/or agribusiness sectors, chromatographic separations of different contaminants and/or substances, monolithic solid phase extraction columns as a stationary phase in water and effluent treatment plants for removing contaminants in solution, pre-concentration in sensing devices, where contaminants are drugs, or diclofenac (all claimed). ADVANTAGE - The three dimensional (3D) nanostructured reduced graphene oxide shows efficiency of adsorption/desorption of environmental contaminant, allows to achieve maximum adsorption efficiency achieved, does not require structural or morphological modifications to improve extraction efficiency, has low preparation cost, self-supporting solid three-dimensional structure and not a powder, the prepared material is easy to pack in the cartridge and does not make use of polyethylene disks on the upper surface, different from commercial cartridges, ensure elimination of the conditioning step, often used in the SPE process, reduce the amount of solvents used, which makes the material environmentally friendly, besides facilitating its use. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for obtaining nanostructured reduced graphene oxide, involves: (A) carrying out oxidation of the graphite; (B) centrifuging the solution; (C) drying the solution in an oven; and (D) forming graphene airgel comprising hydrothermal route and drying in a desiccator, where the product produced is nanostructured reduced graphene oxide.