▎ 摘　　要

NOVELTY - Synergistic treatment of heavy metal polluted water with sulfonated graphene and cationic polyacrylamide emulsion involves adjusting the pH value of the heavy metal polluted water to 5-9. Sulfonated graphene is added in heavy metal polluted water. The obtained mixture is stirred. The obtained mixture is added with cationic polyacrylamide emulsion flocculant. The obtained mixture is stirred uniformly. The obtained mixture is kept stand. The dosage of the sulfonated graphene is 20 to 120 ppm based on the mass concentration in the heavy metal-contaminated water. USE - Method for synergistic treatment of heavy metal polluted water with sulfonated graphene and cationic polyacrylamide emulsion (claimed). ADVANTAGE - The method enables synergistic treatment of heavy metal polluted water with sulfonated graphene and cationic polyacrylamide emulsion in a simple with good flocculating effect. DETAILED DESCRIPTION - Synergistic treatment of heavy metal polluted water with sulfonated graphene and cationic polyacrylamide emulsion involves adjusting the pH value of the heavy metal polluted water to 5-9. Sulfonated graphene is added in heavy metal polluted water. The obtained mixture is stirred. The obtained mixture is added with cationic polyacrylamide emulsion flocculant. The obtained mixture is stirred uniformly. The obtained mixture is kept stand. The dosage of the sulfonated graphene is 20 to 120 ppm based on the mass concentration in the heavy metal-contaminated water. The dosage of cationic polyacrylamide is 10-240ppm. The cation polyacrylamide emulsion is prepared by dissolving cationic monomer in de-ionized water. The obtained mixture is added with dispersion stabilizer, non-ionic monomer and portion of inorganic salt. The obtained mixture is stirred at 45-65 degrees C. The obtained stirred mixture is introduced with nitrogen. The first portion of the initiator is injected. The obtained mixture is reacted for 3.5-6.5 hours. The obtained mixture is reacted for 7-13 hours. The obtained mixture is added with remaining inorganic salt. The obtained mixture is stirred for 20-40 minutes to form white cationic polyacrylamide emulsion. The monomer and the cationic monomer form a monomer system of the reaction system. The relative molecular mass of the dispersion stabilizer is 40-180x 104g/mol. The amount of the dispersion stabilizer accounts for 25-55 wt.% of the whole monomer system. The cationic monomer accounts for 4-55 mol.% of the whole monomer system. The inorganic salt accounts for 15-35 wt.% of the reaction system. The partial inorganic salt accounts for the total mass of the inorganic salt 85-95 wt.%. The amount of the initiator accounts for 0.01-0.1 wt.% of the mass of the monomer system. The first portion of the initiator accounts for the entire amount of the initiator 45-85 wt.%. The cationic monomer is selected from acryloyloxyethyltrimethyl ammonium chloride, methacryloyloxyethyl trimethylammonium chloride, (3-acrylamidopropyl)trimethylammonium chloride , a (3-(methacryloylamino)propyl)trimethylammonium chloride, dimethyldiallylammonium chloride, acryloyloxyethyl ethyl dimethyl benzyl ammonium chloride, methacryloyloxyethyl)trimethylammonium chloride or 2-acrylamido-2-methylpropyltrimethylammonium chloride. The non-ionic monomer is selected from propionamide, methacrylamide, N-methylolacrylamide, N-isopropylmethacrylamide or N,N-Dimethylmethacrylamide.