▎ 摘　　要

NOVELTY - Preparing high-performance dye adsorbent comprises e.g. (i) adding concentrated sulfuric acid into mixture of sodium nitrate and graphite, adding potassium permanganate into mixture A, performing ultrasonic agitation treatment, (ii) adding methyl methacrylate and water into reactor, adding free radical initiator azobisisobutylamidine hydrochloride and water, subjecting polymethylmethacrylate microsphere dispersion to centrifugation, and (iii) adding oxidized graphene dispersion and transition metal salt solvent, and performing high temperature heat treatment. USE - The method is useful for preparing high-performance dye adsorbent (claimed). ADVANTAGE - The method is simple and easy, and is environment friendly and suitable for industrial production. DETAILED DESCRIPTION - Preparing high-performance dye adsorbent comprises (i) adding concentrated sulfuric acid into the mixture of sodium nitrate and graphite under ice bath conditions, stirring for 10-60 minutes to obtain mixture A, where concentration of concentrated sulfuric acid is 95-98%; weight ratio between sodium nitrate and graphite is 0.5-5.5:0.5-5.5; ratio between concentrated sulfuric acid and sodium nitrate is 90-300:0.5-5.5, adding potassium permanganate into mixture A for 12-48 hours to obtain mixture B, where weight ratio between graphite and potassium permanganate is 0.5-5.5:5-25, adding deionized water into mixture B, stirring for 30-60 minutes, raising temperature at 97-99 degrees C, holding for 45- 55 hours to obtain crude product of graphene oxide, adding hydrogen peroxide into crude product of graphene oxide, reacting for 30-60 minutes, filtering, washing and drying to obtain graphene oxide, where weight ratio between potassium permanganate and deionized water is 5-25:25-350, volume ratio between deionized water and hydrogen peroxide is 25-350:50-100; concentration of hydrogen peroxide is 35%, adding graphene into deionized water at room temperature and, performing ultrasonic agitation treatment to obtain oxidized graphene dispersion having concentration of 1-10 mg/ml, (ii) adding methyl methacrylate and water into the reactor and stirring under inert gas for 30-60 minutes to obtain mixture C, placing mixture C in the reactor at ambient temperature, raising temperature at 50-70 degrees C in the reactor, adding free radical initiator azobisisobutylamidine hydrochloride and water, carrying out polymerization reaction to obtain polymethyl methacrylate microsphere dispersion liquid, where polymerization reaction is carried out at 60-80 degrees C for 1-6 hours; and ratio between mixture C, radical initiator azobisisobutylamidine hydrochloride and water is 170-180:0.01-0.02:3-10, subjecting polymethylmethacrylate microsphere dispersion to centrifugation, removing the supernatant, then subjecting remaining to vacuum drying treatment to obtain regular order and closely arranged polymethyl methacrylate crystal template agent, where centrifugation rate is 1000-5000 revolution/minutes, and centrifugation time is 6-12 hours; and drying is carried out at 60-70 degrees C for 3-4 hours, and (iii) adding oxidized graphene dispersion and transition metal salt solvent impregnation to obtain polymer colloidal template, performing high temperature heat treatment under inert gas protection to obtain magnetic hollow graphene composite material. An INDEPENDENT CLAIM is also included for high-performance dye adsorbent and composite material having excellent adsorptive properties obtained by above method.