▎ 摘　　要

NOVELTY - Synthesis of polyphenylene diamine/graphene composite involves ultrasonically dispersing graphene oxide in deionized water, adding m-phenylenediamine monomer, ultrasonically mixing for 5-30 minutes, providing resultant mixed liquid in three-necked flask, heating at 90-100 for 6-24 hours, cooling to room temperature, dripping hydrochloric acid or sulfuric acid solution, reacting, filtering, washing with distilled water to remove excess m-phenylenediamine monomer, and drying. Also claimed is, electrochemical removal of heavy metal ion. USE - Synthesis of polyphenylene diamine/graphene composite used in electrochemical removal of heavy metal ion e.g. divalent copper ion, divalent lead ion, divalent nickel ion and divalent zinc ion (all claimed). ADVANTAGE - The method enables environmentally-friendly synthesis of polyphenylene diamine/graphene composite. The polyphenylene diamine/graphene composite enables electrochemical removal of heavy metal ion by efficient, easy and quick process. DETAILED DESCRIPTION - Synthesis of polyphenylene diamine/graphene composite involves ultrasonically dispersing graphene oxide in deionized water, adding m-phenylenediamine monomer, ultrasonically mixing for 5-30 minutes, providing resultant mixed liquid in three-necked flask, heating at 90-100 for 6-24 hours, cooling to room temperature, dripping hydrochloric acid or sulfuric acid solution as dopant, reacting, filtering, washing with distilled water to remove excess m-phenylenediamine monomer, and drying. The polyphenylene diamine/graphene composite is mixed with polyvinyl alcohol solution, resultant 0.1-0.4 mL dispersion is applied on cardboard, and dried, to obtain poly-m-phenylenediamine/graphene paper electrode. Also claimed is, electrochemical removal of heavy metal ion, which involves placing prepared heavy metal ion solution placed in electrical adsorption reactor, adsorbing heavy metal ion using poly-m-phenylenediamine/graphene paper electrode as working electrode, platinum plate electrode as counter electrode, and calomel electrode as reference electrode, real-time monitoring the solution conductivity, and carrying out desorption regeneration of the electrode.