▎ 摘　　要

NOVELTY - Preparing sulfonated graphene involves dispersing the oxidized graphite in a chloroform solution to obtain oxidized graphene dispersion liquid. The chlorosulfonic acid or concentrated sulfuric acid is added to the oxidized graphene dispersion liquid, allowed to cool and dried and refluxed to obtain sulfonated oxidized graphene. The sulfonated oxidized graphene is subjected to irradiation treatment to obtain sulfonated graphene. USE - Method for preparing sulfonated graphene for detecting heavy metal ions (claimed). ADVANTAGE - The method enables to prepare sulfonated graphene which is easy to process in a quick manner, and effectively solves the problem of complicated process of preparing graphene and works in normal temperature conditions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for detecting heavy metal ions which involves: (A) determining a composite electrode from copolymer of sulfonated graphene and perfluorosulfonic acid-polytetrafluoroethylene copolymer Nafion; (B) using the composite electrode as working electrode of electrochemical workstation device: and (C) detecting the heavy metal ions in test solution by anodic stripping voltammetry.