▎ 摘　　要

NOVELTY - A supported graphene-based nanocomposite material comprises protonated carbon nitride as a nano-bridge, which is loaded on a graphene-based nanomaterial to obtain composite material. USE - Supported graphene-based nanocomposite material for use as nitrite electrochemical sensor (claimed). ADVANTAGE - The supported graphene-based nanocomposite material is prepared efficiently by a simple and easy method with mass production, and is suitable for electrochemical catalysis detection and analysis of nitrites. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing supported graphene-based nanocomposite material, which involves (i) preparing aqueous suspension of graphene oxide using graphite oxide solids under ultrasonic processing condition, (ii) adding protonated carbon nitride to aqueous suspension of graphene oxide and homogenizing ultrasonically, (iii) adding ferric chloride hexahydrate and polyvinylpyrrolidone to the suspension obtained in step (ii) and stirring evenly, (iv) carrying out rapidly hydrothermal reaction, (v) washing and drying.