▎ 摘　　要

NOVELTY - A reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite film modified electrode comprises a base electrode of modified electrode, where the reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite material is prepared by dissolving zinc nitrate in graphene oxide water dispersion and stirring, and transferring mixed solution to a cylindrical plastic tube to obtain a gray-black gel, dissolving 2-methylimidazole in water to obtain a gray-black hydrogel, cutting the gray-black gel in the tube and utilizing N,N-dimethylformamide dissolves the agar in the gel to obtain three black reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composites, polishing the base electrode to obtain glassy carbon electrode, applying dispersed droplet to the surface of the treated glassy carbon electrode and modifying the reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite film to glassy carbon electrode. USE - Reduced graphene oxide coated zeolitic imidazolate framework composite film modified electrode. ADVANTAGE - The reduced graphene oxide coated zeolitic imidazolate framework composite film modified electrode has large active area, multiple active sites, better dispersibility, improved electrochemical and electro-catalysis property, conductivity and catalytic performance, high sensitivity, in rapid manner. DETAILED DESCRIPTION - A reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite film modified electrode comprises a base electrode of modified electrode, where the base electrode of modified electrode is glassy carbon electrode, the modified material is a reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite film, the reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite material is prepared by utilizing a natural diffusion osmosis method and a thermal reduction method in a gel matrix containing graphene oxide, preparing reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) by utilizing ultrasonic dispersion method to prepare graphene oxide to a concentration of 1 mg/mL of 20-40 mL graphene oxide water dispersion into the beaker, weighing 0.595 g zinc nitrate and dissolving, adding a certain amount of agar powder to make the final mass concentration of 0.5%, stirring until the agar powder is completely dissolved, after adding 30 mL N,N-dimethylformamide, continuously stirring for 30 minutes, and transferring certain volume of mixed solution to a cylindrical plastic tube of 12 mm x 100 mm while hot to reach two-thirds of the height of the plastic tube of six plastic tubes are made in parallel, sealing with a sealing film, and allowing to stand at room temperature for 2 hours, and gelling an agar to obtain a gray-black gel, dissolving 3.284 g 2-methylimidazole in a volume ratio of 1:1 water and N,N-dimethylformamide mixed solvent, stirring and dissolving completely, and injecting it into the gelled 6 plastic tubes, the remaining one-third of the space of the tube, after the sealing film is sealed, allowing two angels to stand for diffusion and permeation reaction to obtain a gray-black hydrogel, cutting 6 plastic tubes from the edge, cutting the gray-black gel in the tube into three segments from top to bottom according to the length of 5 mm, and enriching an upper, middle and lower sections of the parallel tube, utilizing N, N-dimethylformamide dissolves the agar in the gel, after centrifugation, collecting an insoluble precipitates of the upper, middle and lower sections, drying three gray-black precipitate samples at 150 degrees C for 2 hours to obtain three black reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composites, polishing the base electrode to a mirror surface, ultrasonically cleaning with an ultrapure water, and naturally drying at room temperature to obtain a processed glassy carbon electrode, ultrasonically dispersing the reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite in deionized water to prepare a dispersion having a concentration of 1 mg/mL, applying 2-20 mu L dispersed droplet to the surface of the treated glassy carbon electrode at room temperature, after natural drying, modifying the reduced graphene oxide coated zeolitic imidazolate framework (ZIF-8) composite film to glassy carbon electrode. An INDEPENDENT CLAIM is also included for a method for detecting naphthol isomer, which invovles utilizing 0.1 mol/L pH 7.5 phosphate buffer as the supporting electrolyte, and adding a solution containing different amounts of alpha -naphthol and beta -naphthol alone to the electrolytic cell to modify the electrode as a working electrode, utilizing a difference pulse voltammetry to obtain the linear regression equations of the oxidation peak current and its concentration of alpha -naphthol and beta -naphthol, determining an oxidation peak currents of alpha -naphthol and beta -naphthol in the sample to be tested by the same method and determining the content of alpha -naphthol and beta -naphthol in the sample to be tested by utilizing a linear regression equation.