▎ 摘　　要

NOVELTY - Binary manganese-based spinel oxide-graphene nanocomposite electrochemical sensor is a nanocomposite material of binary manganese-based spinel oxide grown on the surface of graphene. The binary manganese-based spinel oxide is nickel manganite or nickel manganite. The modified electrode is constructed as an electrochemical sensor. The binary manganese-based spinel oxide-graphene nanocomposite electrochemical sensor is prepared by dispersing graphene in a mixed solution of ethylene glycol and water for 30 minutes, and mixing 2.002-6.497 mmol/L nickel or zinc nitrate and 2.002-6.497 mmol/L manganese (II) nitrate with the graphene solution under stirring for 30 minutes. 2.995-6.997 mmol/L urea is added to obtain a homogeneous solution. USE - Binary manganese-based spinel oxide-graphene nanocomposite electrochemical sensor for detecting lead ions and mercury ions in water samples (claimed). ADVANTAGE - Adv: --- The binary manganese-based spinel oxide-graphene nanocomposite electrochemical sensor has high sensitivity, good stability and reproducibility, and can be prepared in a simple manner with improved electron transfer efficiency and sensitivity. DETAILED DESCRIPTION - Binary manganese-based spinel oxide-graphene nanocomposite electrochemical sensor is a nanocomposite material of binary manganese-based spinel oxide grown on the surface of graphene. The binary manganese-based spinel oxide is nickel manganite or nickel manganite. The modified electrode is constructed as an electrochemical sensor. The binary manganese-based spinel oxide-graphene nanocomposite electrochemical sensor is prepared by dispersing graphene in a mixed solution of ethylene glycol and water for 30 minutes, and mixing 2.002-6.497 mmol/L nickel or zinc nitrate and 2.002-6.497 mmol/L manganese (II) nitrate with the graphene solution under stirring for 30 minutes. 2.995-6.997 mmol/L urea is added to obtain a homogeneous solution. The solution is placed in a reaction kettle at 140-200degrees Celsius for 12-24 hours, cooled to room temperature naturally, centrifuged the reaction mixture at 9000 revolutions per minute (rpm) for 20 minutes, washed the sample repeatedly with water and ethanol, and then vacuum-dried at 60degrees Celsius overnight to obtain the precursor sample. The prepared precursor sample is heated to 300-500degrees Celsius in air at a heating rate of 5degrees Celsius/minute for 1-3 hours to obtain binary manganese-based oxide-graphene. The glassy carbon electrode is fully polished with alumina slurry and thoroughly cleaned until a mirror-like surface is obtained by ultrasonic cleaning in secondary water and acetone or ultrapure water and ethanol. The manganese-based spinel oxide-GR is dispersed in 1 ml ultrapure water to prepare a dispersion with a concentration of 1.0mg/ml. The dispersion is applied to the glassy carbon electrode in a droplet amount of 6.0-14.0muL, and then dried at room temperature to obtain the binary manganese-based spinel oxide-nanocomposite electrochemical sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a process for preparing binary manganese-based spinel oxide-graphene nanocomposite electrochemical sensor. (Drawing includes non-English language text).