▎ 摘　　要

NOVELTY - Preparation of bismuth nanoparticle loaded graphene paper involves coating a graphene oxide solution on a substrate, drying, peeling off to obtain graphene oxide paper, placing in a mixed solution of bismuth salt and an organic ligand to carry out Solvothermal reaction to obtain a metal-organic framework material modified graphene oxide paper, calcining under non-oxidizing protective gas conditions, reducing bismuth ions in the metal-organic framework material to bismuth nanoparticles, converting the organic ligand that forms metal-organic framework material into porous carbon, and reducing graphene oxide to graphene and obtain product. USE - Preparation of bismuth nanoparticle loaded graphene paper used as flexible self-supporting electrode for electrochemically detecting heavy metal ions including lead ion, zinc ion and/or cadmium ion (all claimed). ADVANTAGE - The method provides bismuth nanoparticle loaded graphene paper, which can be directly used as flexible self-supporting electrode in electrochemical sensing system, and can achieve simultaneous online detection of various heavy metal ions with low detection limit, wide linear range and high sensitivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the bismuth nanoparticle loaded graphene paper.