▎ 摘　　要

NOVELTY - Preparation of low-cost graphene microsheet comprises taking humic acid as carbon source, adding reducing agent, heating, performing reduction reaction under non-oxidizing atmosphere to obtain graphene precursor, treating with acid, drying, and vacuum-heating. USE - Method for preparing low-cost graphene microsheet (claimed) used for sewage treatment, soil pollution treatment, atmosphere pollution treatment, solid lubricant, seawater desalination, energy, paint and polymer composite material. ADVANTAGE - The graphene microsheet has wide raw material source, low cost, short process flow, simple production equipment, short production period and small environmental pollution, and is easy to implement for industrial-scale production.