▎ 摘　　要

NOVELTY - Preparing sulfur-doped porous tube bundle carbon nitride/graphene composite material involves dispersing melamine and thiocyanuric acid in distilled water under stirring formed melamine-thiocyanuric acid supramolecular precursor, and then drying and grinding into powder. The obtained powder is put into crucible in a muffle furnace at 550 degrees C for 2 hours, then cooled to obtain graphite phase carbon nitride. The graphite phase carbon nitride is dispersed in distilled water to prepare graphite phase carbon nitride aqueous solution. The graphene aqueous solution is added to sulfuric acid solution under stirring to obtain a graphene-sulfuric acid dispersion. The graphite phase carbon nitride aqueous solution is added to the graphene dispersion under stirring to obtain a sulfur doped solution. USE - Method for preparing sulfur-doped porous tube bundle carbon nitride/graphene composite material used as electrode or electrode modified material for heavy metal ion electrochemical detection sensor for detecting heavy metal ions (all claimed). ADVANTAGE - The method prepares the sulfur-doped porous tube bundle carbon nitride/graphene composite material in a simple, cost-effective and eco-friendly manner with excellent conductivity, and improved electrochemical detection performance.