▎ 摘　　要

NOVELTY - A chemically-modified oxidized graphene ionic-type sewage treatment agent (I) is prepared by oxidizing graphene, and carrying out chemical reaction of the oxidized graphene with an organic phosphoric acid and an organosiloxane. USE - Chemically-modified oxidized graphene ionic-type sewage treatment agent used for treating industrial wastewater containing heavy metal ions e.g. divalent lead and hexavalent chromium. ADVANTAGE - The chemically-modified oxidized graphene ionic-type sewage treatment agent is effective, and has excellent adsorption selectivity with respect to heavy metal ions. DETAILED DESCRIPTION - A chemically-modified oxidized graphene ionic-type sewage treatment agent is prepared by oxidizing graphene, and carrying out chemical reaction of the oxidized graphene with an organic phosphoric acid and an organosiloxane. The chemically modified oxidized graphene ion-type sewage treatment agent is of formula (I). An INDEPENDENT CLAIM is included for preparation of chemically-modified oxidized graphene ionic-type sewage treatment agent, which involves washing graphene oxide with 0.05-0.10 mol/L hydrochloric acid solution and deionized water, filtering, vacuum-drying to obtain a oxidized graphene, adding 5 pts. wt. nitrogen-containing organic phosphoric acid compound to a solution of methanol or ethanol, adding 4-5 pts. wt. organosiloxane, stirring at 25-35 degrees C for 2 hours to obtain a solution, adding 50-100 pts. wt. oxidized graphene to the solution, stirring at 25-35 degrees C for 24 hours, filtering, washing with methanol or ethanol and water, and vacuum-drying at 40-50 degrees C for 24 hours.