▎ 摘　　要

NOVELTY - Sulfur-doped graphene quantum dot preparation involves mixing carbon compounds and water-soluble sulfur source compounds to undergo hydrothermal reaction under basic conditions to obtain a sulfur-doped graphene quantum dot. The carbon source compound is 1,3,6-trinitro pyrene. The water-soluble sulfur source compound is a sulfide salt. USE - Method for preparing sulfur-doped graphene quantum dot used for detecting lead ions (all claimed). ADVANTAGE - The method prepares the sulfur-doped graphene quantum dot in a simple and cost-effective manner with high ion selective recognition capability. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic X-ray diffraction image of the sulfur-doped graphene quantum dot.