▎ 摘　　要

NOVELTY - A sulfonated graphene/polyaniline composite material is prepared by subjecting natural graphite to chemical oxidization to obtain sulfonated graphene, dispersing in water to obtain sulfonated graphene aqueous solution (2 mg/ml), adding aniline (0.02-0.5 mol/l), mixing to obtain solution A, dissolving ammonium persulfate in hydrochloric acid at a mole ratio of 0.5-2:1, adding obtain solution to solution A, stirring for 6-24 hours, filtering, washing the filter cake until the washing solution is colorless, and vacuum drying. USE - Method of preparing a sulfonated graphene/polyaniline composite material for use as mercury ion absorbent in mercury ion containing wastewater (claimed). ADVANTAGE - The method is low cost, and has good absorption performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of using the sulfonated graphene/polyaniline composite material as mercury ion absorbent in mercury ion containing wastewater comprising adding composite material (10-70 mg) to wastewater (30 ml) having mercury ion content of 30-60 mg/l, reacting for 0.5-120 hours, and adjusting pH value of wastewater to 4-8.