▎ 摘　　要

NOVELTY - A metal composite oxide doped graphene film modified electrode preparing method involves dissolving zirconium oxychloride, copper salt compound and high molecular polymer in an organic solvent to form a polymer solution, and adding alkali solution until precipitate occurs. The precipitate is dried and decomposed to obtain a nano-zirconia-copper oxide composite. The nano-zirconia-copper oxide composite is mixed with graphene particles and ethanol to prepare metal composite oxide-doped graphene modified liquid. The modified liquid is coated on a bare electrode to obtain the finished product. USE - Method for preparing metal composite oxide doped graphene film modified electrode for use as sensing electrode for measuring trace levels of lead and cadmium ions in water and soil dissolution. ADVANTAGE - The method enables preparing metal composite oxide doped graphene film modified electrode with better stability, large specific surface area, rich in hydroxyl and heavy metal ion and increased conductivity, in cost effective manner. DETAILED DESCRIPTION - A metal composite oxide doped graphene film modified electrode preparing method involves dissolving zirconium oxychloride, copper salt compound and high molecular polymer in an organic solvent to form a polymer solution, and adding alkali solution until precipitate occurs. The precipitate is dried and decomposed under high temperature in an air atmosphere to obtain a nano-zirconia-copper oxide composite. The nano-zirconia-copper oxide composite is mixed with active graphene particles and ethanol solution and added with Nafion (RTM: Sulfonated tetrafluoroethylene based fluoropolymer-copolymer) to prepare metal composite oxide-doped graphene modified liquid. The modified liquid is coated on a bare electrode to obtain the finished product.