▎ 摘　　要

NOVELTY - Method for preparing functionalized graphene composite EDTA- beta -cyclodextrin-reduced graphene oxide (EDTA- beta -CD-rGO), involves uniformly dispersing beta -CD and GO in secondary water, stirring for 10-25 minutes, fully mixing, adjusting the pH value of the solution to 9-10 by adding concentrated aqueous ammonia during stirring, adding hydrazine hydrate, stirring for 5-15 minutes, adding EDTA aqueous solution to the above mixed system, heating the mixture at 50-70 degrees C for 3-5 hours in a water bath under stirring, cooling to room temperature, centrifuging at 12000-13000 rpm for 10-30 minutes, washing, removing supernatant and washing the precipitate twice with secondary water to obtain the product, where the mass ratio of GO, beta -CD, concentrated ammonia, hydrazine hydrate, EDTA and secondary water is 2.5:(7-9):(80-100):(15-25):(120-180):(7-8). USE - The method is useful for preparing functionalized graphene composite EDTA- beta -CD-rGO for preparing modified glassy carbon electrode used in free radical detection (all claimed). ADVANTAGE - The method provides the graphene composite which has excellent conductivity and excellent enrichment, greatly improves the detection performance, uses electrochemical differential pulse voltammetry to examine the electrochemical performance of the composite, and enables rapid and sensitive detection of DPPH. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a EDTA- beta -CD-rGO prepared by the above method; (2) a modified glassy carbon electrode prepared by modifying the glassy carbon electrode with EDTA- beta -CD-rGO; (3) a method for preparing the modified glassy carbon electrode, involving dispersing the EDTA- beta -CD-rGO in a black uniform suspension of 1 mg/ml with deionized water, applying the suspended droplets on the glassy carbon electrode, and naturally drying to obtain the product; and (4) an application of the modified glassy carbon electrode in free radical detection.