▎ 摘　　要

NOVELTY - A graphene nano-nickel electrode nitrophenol determining method involves purifying a carbon electrode. The electrode is polished with aluminum oxide slurry and cleaned. The polished electrode is dried to obtain a pure carbon electrode followed by preparing graphene/nanonickel composite material, preparing modified carbon electrode, preparing test solution, taking graphene/nanonickel composite material as working electrode, molybdenum electrode as counter electrode, mercury/mercury oxide as reference electrode and measuring nitrophenol by graph showing electrochemical redox curve. USE - Method for determining nitrophenol in a graphene nano-nickel electrode. DETAILED DESCRIPTION - A graphene nano-nickel electrode nitrophenol determining method involves purifying a carbon electrode, and leaching a pure carbon electrode in concentrated nitric acid at 18-30 degrees C. The electrode is polished with aluminum oxide slurry and cleaned using acetone and anhydrous ethanol. The polished electrode is dried at 40-60 degrees C for 18-30 hours to obtain the pure carbon electrode. The graphene/nano-nickel composite material is prepared by adding nickel chloride hexahydrate and ethylene glycol and dissolving the mixture at room temperature. The graphite alkene is added into mixture, and pH is adjusted to 8-9 using 0.4 mol/l sodium hydroxide solution. The reducing agent hydrazine hydrate is added into mixture and stirring uniformly. The mixture is transferred into a stainless steel reaction kettle at 120 degrees C for 4 hours and cooled at room temperature. The obtained mixture is filtered, and dilute sulfuric acid is added to remove insoluble substance. The substance is washed using deionized water to obtain graphene/nanonickel composite material and dried at 50 degrees C for 24 hours. The dried material is grinded into powder. The modified carbon electrode composite material is prepared by dispersing graphene/nanonickel composite material into nafion solution to obtain dispersion and coating dispersion into electrode surface. The electrode is dried at room temperature for 2-4 hours to obtain modified carbon electrode. The test solution is prepared by selecting test sample and adding 1.5 mol/l sodium hydroxide to obtain test solution followed by taking graphene/nanonickel composite material as working electrode, molybdenum electrode as counter electrode, mercury/mercury oxide as reference electrode, measuring nitrophenol using three electrode system for electrochemical performance, adding test solution into cell, plugging into working electrode, counter electrode and reference electrode with scanning voltage of 0.1-0.8 V, scan rate of 100 mV to obtain a graph showing the electrochemical oxidation-reduction curve and determining p-nitrophenol by presence of oxidation-reduction peak.