▎ 摘　　要

NOVELTY - Preparing hydroxylated magnetic graphene oxide adsorbent comprises e.g. (1) adding graphene oxide into the ethylene glycol solvent, dispersing using magnetic stirring, uniformly dispersing in ethylene glycol solvent using ultrasonic waves, adding sodium dodecyl benzene sulfonate, ferric chloride pentahydrate and sodium oxalate into the graphene oxide dispersion, and magnetically stirring, (2) transferring the suspension to the hydrothermal reactor, placing the reactor in an oven, and cooling to room temperature, removing out the product, and drying to obtain black powder i.e., magnetic graphene oxide, and (3) providing deionized water, adjusting pH using dilute hydrochloric acid solution, adding ferrous chloride tetrahydrate to obtain base solution of the hydroxylation reaction, adding magnetic graphene oxide into the base solution, adding peroxide solution for reacting, performing magnetic separation, washing and drying to obtain hydroxylated magnetic graphene oxide material. USE - The method is useful for preparing hydroxylated magnetic graphene oxide adsorbent. ADVANTAGE - The adsorbent increases exfoliation degree of the graphene oxide, expands specific surface area, and increases active sites on the surface of the composite material through the hydroxylation reaction to enhance the adsorption performance of the material. The method is simple and easy to operate, has green and environmentally friendly adsorption process, effectively adsorbs methylene blue in the dye wastewater, and avoids secondary pollution. DETAILED DESCRIPTION - Preparing hydroxylated magnetic graphene oxide adsorbent comprises (1) adding graphene oxide into the ethylene glycol solvent, dispersing using magnetic stirring, uniformly dispersing in ethylene glycol solvent using ultrasonic waves, adding sodium dodecyl benzene sulfonate, ferric chloride pentahydrate and sodium oxalate into the graphene oxide dispersion, and magnetically stirring until uniform suspension is formed, (2) transferring the suspension to the hydrothermal reactor, placing the reactor in an oven, setting the reaction temperature and time, completing the reaction, placing in an oven, and cooling to room temperature, removing out the product, and drying to obtain black powder i.e., magnetic graphene oxide, and (3) providing deionized water, adjusting pH to 3-4 using dilute hydrochloric acid solution, adding ferrous chloride tetrahydrate to obtain base solution of the hydroxylation reaction, adding magnetic graphene oxide into the base solution, adding peroxide solution for reacting, completing the hydroxylation, performing magnetic separation, washing and drying to obtain hydroxylated magnetic graphene oxide material.