▎ 摘　　要

NOVELTY - Magnetic cellulose/graphene oxide composite adsorbent is prepared by mixing cellulose, graphene oxide and ferroferric oxide nanoparticles. USE - The composite adsorbent is useful for sewage treatment, and in field of environmental management. ADVANTAGE - The composite adsorbent is convenient to recover after adsorption, prepared using simple equipment and easy for industrialization, and has low cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of the above-mentioned composite adsorbent, which involves preparing solution comprising sodium hydroxide/thiourea/urea/water, pre-cooling the solution in ice-salt bath, adding the solution and cellulose to high speed stirrer, stirring solution to obtain transparent cellulose solution, purifying product by subjecting the solution to centrifugation to remove insoluble substances and bubbles, performing ultrasonic dispersion of ferroferric oxide nanoparticles and graphene oxide, adding obtained dispersed solution to purified cellulose solution, stirring the solution continuously for 1 hour, stopping the stirring process, pouring obtained suspension into aqueous sodium chloride contained in solidification bath, stirring solution vigorously, aging obtained product for 12 hours, stirring the solution continuously, slowly adding epoxy chloropropane to the solution, allowing cross-linking to occur, increasing temperature of the solution to 70 degrees C, continuously stirring the solution for 150 minutes to obtain magnetic cellulose/graphene oxide composite material, subjecting the material to magnetic separation, washing separated product using deionized water and anhydrous ethyl alcohol until pH of the product becomes neutral, and finally vacuum-drying neutralized product to constant weight.