▎ 摘　　要

NOVELTY - A dual-functionalized graphene sulfhydryl modified glassy carbon electrode preparation method involves treating mercapto functionalized graphene with sodium hydroxide, and introducing an amino group into a silylating reagent to prepare amino-functionalized graphene. A double sulfhydryl reagent is prepared by reacting double mercapto acid anhydride with the obtained product. The amino functionalized graphene and bis mercapto anhydride are reacted to obtain bis mercapto functionalized graphene, which is followed by drying obtained product at room temperature to obtain the electrode. USE - Method for preparing a dual-functionalized graphene sulfhydryl modified glassy carbon electrode. ADVANTAGE - The method enables preparing the dual-functionalized graphene sulfhydryl modified glassy carbon electrode with high sensitivity, wide linear range, and low detection limit for direct use of trace amount of cadmium ion for fast electrode. DETAILED DESCRIPTION - A dual-functionalized graphene sulfhydryl modified glassy carbon electrode preparation method involves treating mercapto functionalized graphene with sodium hydroxide, and introducing an amino group into a silylating reagent to prepare amino-functionalized graphene. A double sulfhydryl reagent is prepared by reacting double mercapto acid anhydride with the obtained product. The amino functionalized graphene and bis mercapto anhydride are reacted to obtain bis mercapto functionalized graphene. The dual mercapto functionalized graphene is subjected to ultrasonic dispersion in 0.1-1 mg/L dispersion liquid. 3-15 mg/L of the solution is taken and dispensed onto a mirror polished glassy carbon electrode surface. The obtained product is dried at room temperature to obtain dual-functionalized graphene sulfhydryl modified glassy carbon electrode. An INDEPENDENT CLAIM is also included for a dual-functionalized graphene sulfhydryl modified glassy carbon electrode comprising a working electrode, a saturated calomel electrode as a reference electrode, and molybdenum electrodes and cadmium ions in aqueous solution.