▎ 摘　　要

NOVELTY - Preparing a graphene composite silicon dioxide electrochemical electrode involves preparing a silicon dioxide nano-modified support by dissolving vinyltrimethoxysilane in absolute ethyl alcohol and stirring it uniformly to obtain stirred solution. The solid silicon dioxide carrier is added to stirred solution, and pH value is adjusted with ammonia water. The obtained solution is reacted under constant temperature for a period of time to obtain reacted silicon dioxide nano-modified support, which is dried in a constant temperature drying box. The graphene electrode is prepared by placing nano-modified support in a clean quartz boat, and pushing quartz boat containing nano-modified support into middle of tube muffle furnace. The temperature and time of muffle furnace is set to carry out program temperature increase. USE - Method for preparing a graphene composite silicon dioxide electrochemical electrode. ADVANTAGE - The method enables to prepare a graphene composite silicon dioxide electrochemical electrode, which is sensitive electrode, has low resistance, long life, good stability, strong resistance to oxidation and corrosion, efficient and safe preparation scheme, and effectively solves problem of uneconomical, unsafe, short life, and poor stability of electrode. DETAILED DESCRIPTION - Preparing a graphene composite silicon dioxide electrochemical electrode involves preparing a silicon dioxide nano-modified support by dissolving vinyltrimethoxysilane in absolute ethyl alcohol and stirring it uniformly to obtain stirred solution. The solid silicon dioxide carrier is added to stirred solution, and pH value is adjusted with ammonia water. The obtained solution is reacted under constant temperature for a period of time to obtain reacted silicon dioxide nano-modified support, which is dried in a constant temperature drying box. The graphene electrode is prepared by placing nano-modified support in a clean quartz boat, and pushing quartz boat containing nano-modified support into middle of tube muffle furnace. The temperature and time of muffle furnace is set to carry out program temperature increase. The nitrogen gas is introduced at same time, and when muffle furnace reaches set temperature then nitrogen is turned off and petroleum waste heated to a predetermined temperature is passed into tube muffle furnace, and reaction is started. The petroleum waste control pipe valve and muffle furnace are closed, and nitrogen gas is introduced after completing reaction. The muffle furnace is cooled to room temperature under nitrogen-filled conditions, and quartz boat in tube is taken out to obtain a silicon dioxide nano-modified composite electrode with a layer of graphene attached to surface.